The Great Tuple to Symbol Rename (tm)

32 files changed, 1209 insertions, 1209 deletions

diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/AddBackSuppressedSequenceTablesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/AddBackSuppressedSequenceTablesCommand.cs
index d83e3684..cbba6030 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/AddBackSuppressedSequenceTablesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/AddBackSuppressedSequenceTablesCommand.cs
@@ -4,7 +4,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 {
     using System;
     using System.Collections.Generic;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
 
     /// <summary>
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/AddCreateFoldersCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/AddCreateFoldersCommand.cs
index ba844da4..c4fddb3e 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/AddCreateFoldersCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/AddCreateFoldersCommand.cs
@@ -5,10 +5,10 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Collections.Generic;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
 
     /// <summary>
-    /// Add CreateFolder tuples, if not already present, for null-keypath components.
+    /// Add CreateFolder symbols, if not already present, for null-keypath components.
     /// </summary>
     internal class AddCreateFoldersCommand
     {
@@ -21,15 +21,15 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            var createFolderTuplesByComponentRef = new HashSet<string>(this.Section.Tuples.OfType<CreateFolderTuple>().Select(t => t.ComponentRef));
-            foreach (var componentTuple in this.Section.Tuples.OfType<ComponentTuple>().Where(t => t.KeyPathType == ComponentKeyPathType.Directory).ToList())
+            var createFolderSymbolsByComponentRef = new HashSet<string>(this.Section.Symbols.OfType<CreateFolderSymbol>().Select(t => t.ComponentRef));
+            foreach (var componentSymbol in this.Section.Symbols.OfType<ComponentSymbol>().Where(t => t.KeyPathType == ComponentKeyPathType.Directory).ToList())
             {
-                if (!createFolderTuplesByComponentRef.Contains(componentTuple.Id.Id))
+                if (!createFolderSymbolsByComponentRef.Contains(componentSymbol.Id.Id))
                 {
-                    this.Section.AddTuple(new CreateFolderTuple(componentTuple.SourceLineNumbers)
+                    this.Section.AddSymbol(new CreateFolderSymbol(componentSymbol.SourceLineNumbers)
                     {
-                        DirectoryRef = componentTuple.DirectoryRef,
-                        ComponentRef = componentTuple.Id.Id,
+                        DirectoryRef = componentSymbol.DirectoryRef,
+                        ComponentRef = componentSymbol.Id.Id,
                     });
                 }
             }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/AssignMediaCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/AssignMediaCommand.cs
index 773b3225..eccc97d2 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/AssignMediaCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/AssignMediaCommand.cs
@@ -8,7 +8,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Linq;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Extensibility.Services;
 
     /// <summary>
@@ -40,7 +40,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// <summary>
         /// Gets cabinets with their file rows.
         /// </summary>
-        public Dictionary<MediaTuple, IEnumerable<FileFacade>> FileFacadesByCabinetMedia { get; private set; }
+        public Dictionary<MediaSymbol, IEnumerable<FileFacade>> FileFacadesByCabinetMedia { get; private set; }
 
         /// <summary>
         /// Get uncompressed file rows. This will contain file rows of File elements that are marked with compression=no.
@@ -50,49 +50,49 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            var mediaTuples = this.Section.Tuples.OfType<MediaTuple>().ToList();
-            var mediaTemplateTuples = this.Section.Tuples.OfType<WixMediaTemplateTuple>().ToList();
+            var mediaSymbols = this.Section.Symbols.OfType<MediaSymbol>().ToList();
+            var mediaTemplateSymbols = this.Section.Symbols.OfType<WixMediaTemplateSymbol>().ToList();
 
-            // If both tuples are authored, it is an error.
-            if (mediaTemplateTuples.Count > 0 && mediaTuples.Count > 1)
+            // If both symbols are authored, it is an error.
+            if (mediaTemplateSymbols.Count > 0 && mediaSymbols.Count > 1)
             {
                 throw new WixException(ErrorMessages.MediaTableCollision(null));
             }
 
-            // If neither tuple is authored, default to a media template.
-            if (SectionType.Product == this.Section.Type && mediaTemplateTuples.Count == 0 && mediaTuples.Count == 0)
+            // If neither symbol is authored, default to a media template.
+            if (SectionType.Product == this.Section.Type && mediaTemplateSymbols.Count == 0 && mediaSymbols.Count == 0)
             {
-                var mediaTemplate = new WixMediaTemplateTuple()
+                var mediaTemplate = new WixMediaTemplateSymbol()
                 {
                     CabinetTemplate = "cab{0}.cab",
                 };
 
-                this.Section.AddTuple(mediaTemplate);
-                mediaTemplateTuples.Add(mediaTemplate);
+                this.Section.AddSymbol(mediaTemplate);
+                mediaTemplateSymbols.Add(mediaTemplate);
             }
 
             // When building merge module, all the files go to "#MergeModule.CABinet".
             if (SectionType.Module == this.Section.Type)
             {
-                var mergeModuleMediaTuple = this.Section.AddTuple(new MediaTuple
+                var mergeModuleMediaSymbol = this.Section.AddSymbol(new MediaSymbol
                 {
                     Cabinet = "#MergeModule.CABinet",
                 });
 
-                this.FileFacadesByCabinetMedia = new Dictionary<MediaTuple, IEnumerable<FileFacade>>
+                this.FileFacadesByCabinetMedia = new Dictionary<MediaSymbol, IEnumerable<FileFacade>>
                 {
-                    { mergeModuleMediaTuple, this.FileFacades }
+                    { mergeModuleMediaSymbol, this.FileFacades }
                 };
 
                 this.UncompressedFileFacades = Array.Empty<FileFacade>();
             }
-            else if (mediaTemplateTuples.Count == 0)
+            else if (mediaTemplateSymbols.Count == 0)
             {
-                var filesByCabinetMedia = new Dictionary<MediaTuple, List<FileFacade>>();
+                var filesByCabinetMedia = new Dictionary<MediaSymbol, List<FileFacade>>();
 
                 var uncompressedFiles = new List<FileFacade>();
 
-                this.ManuallyAssignFiles(mediaTuples, filesByCabinetMedia, uncompressedFiles);
+                this.ManuallyAssignFiles(mediaSymbols, filesByCabinetMedia, uncompressedFiles);
 
                 this.FileFacadesByCabinetMedia = filesByCabinetMedia.ToDictionary(kvp => kvp.Key, kvp => (IEnumerable<FileFacade>)kvp.Value);
 
@@ -100,11 +100,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
             else
             {
-                var filesByCabinetMedia = new Dictionary<MediaTuple, List<FileFacade>>();
+                var filesByCabinetMedia = new Dictionary<MediaSymbol, List<FileFacade>>();
 
                 var uncompressedFiles = new List<FileFacade>();
 
-                this.AutoAssignFiles(mediaTuples, filesByCabinetMedia, uncompressedFiles);
+                this.AutoAssignFiles(mediaSymbols, filesByCabinetMedia, uncompressedFiles);
 
                 this.FileFacadesByCabinetMedia = filesByCabinetMedia.ToDictionary(kvp => kvp.Key, kvp => (IEnumerable<FileFacade>)kvp.Value);
 
@@ -116,7 +116,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// Assign files to cabinets based on MediaTemplate authoring.
         /// </summary>
         /// <param name="fileFacades">FileRowCollection</param>
-        private void AutoAssignFiles(List<MediaTuple> mediaTable, Dictionary<MediaTuple, List<FileFacade>> filesByCabinetMedia, List<FileFacade> uncompressedFiles)
+        private void AutoAssignFiles(List<MediaSymbol> mediaTable, Dictionary<MediaSymbol, List<FileFacade>> filesByCabinetMedia, List<FileFacade> uncompressedFiles)
         {
             const int MaxCabIndex = 999;
 
@@ -125,15 +125,15 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             var maxPreCabSizeInMB = 0;
             var currentCabIndex = 0;
 
-            MediaTuple currentMediaRow = null;
+            MediaSymbol currentMediaRow = null;
 
-            var mediaTemplateTable = this.Section.Tuples.OfType<WixMediaTemplateTuple>();
+            var mediaTemplateTable = this.Section.Symbols.OfType<WixMediaTemplateSymbol>();
 
-            // Remove all previous media tuples since they will be replaced with
+            // Remove all previous media symbols since they will be replaced with
             // media template.
-            foreach (var mediaTuple in mediaTable)
+            foreach (var mediaSymbol in mediaTable)
             {
-                this.Section.Tuples.Remove(mediaTuple);
+                this.Section.Symbols.Remove(mediaSymbol);
             }
 
             // Auto assign files to cabinets based on maximum uncompressed media size
@@ -169,7 +169,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 throw new WixException(ErrorMessages.MaximumUncompressedMediaSizeTooLarge(null, maxPreCabSizeInMB));
             }
 
-            var mediaTuplesByDiskId = new Dictionary<int, MediaTuple>();
+            var mediaSymbolsByDiskId = new Dictionary<int, MediaSymbol>();
 
             foreach (var facade in this.FileFacades)
             {
@@ -193,8 +193,8 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     // Overflow due to current file
                     if (currentPreCabSize > maxPreCabSizeInBytes)
                     {
-                        currentMediaRow = this.AddMediaTuple(mediaTemplateRow, ++currentCabIndex);
-                        mediaTuplesByDiskId.Add(currentMediaRow.DiskId, currentMediaRow);
+                        currentMediaRow = this.AddMediaSymbol(mediaTemplateRow, ++currentCabIndex);
+                        mediaSymbolsByDiskId.Add(currentMediaRow.DiskId, currentMediaRow);
                         filesByCabinetMedia.Add(currentMediaRow, new List<FileFacade>());
 
                         // Now files larger than MaxUncompressedMediaSize will be the only file in its cabinet so as to respect MaxUncompressedMediaSize
@@ -205,8 +205,8 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         if (currentMediaRow == null)
                         {
                             // Create new cab and MediaRow
-                            currentMediaRow = this.AddMediaTuple(mediaTemplateRow, ++currentCabIndex);
-                            mediaTuplesByDiskId.Add(currentMediaRow.DiskId, currentMediaRow);
+                            currentMediaRow = this.AddMediaSymbol(mediaTemplateRow, ++currentCabIndex);
+                            mediaSymbolsByDiskId.Add(currentMediaRow.DiskId, currentMediaRow);
                             filesByCabinetMedia.Add(currentMediaRow, new List<FileFacade>());
                         }
                     }
@@ -219,52 +219,52 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
 
             // If there are uncompressed files and no MediaRow, create a default one.
-            if (uncompressedFiles.Count > 0 && !this.Section.Tuples.OfType<MediaTuple>().Any())
+            if (uncompressedFiles.Count > 0 && !this.Section.Symbols.OfType<MediaSymbol>().Any())
             {
-                var defaultMediaRow = this.Section.AddTuple(new MediaTuple(null, new Identifier(AccessModifier.Private, 1))
+                var defaultMediaRow = this.Section.AddSymbol(new MediaSymbol(null, new Identifier(AccessModifier.Private, 1))
                 {
                     DiskId = 1,
                 });
 
-                mediaTuplesByDiskId.Add(1, defaultMediaRow);
+                mediaSymbolsByDiskId.Add(1, defaultMediaRow);
             }
         }
 
         /// <summary>
         /// Assign files to cabinets based on Media authoring.
         /// </summary>
-        private void ManuallyAssignFiles(List<MediaTuple> mediaTuples, Dictionary<MediaTuple, List<FileFacade>> filesByCabinetMedia, List<FileFacade> uncompressedFiles)
+        private void ManuallyAssignFiles(List<MediaSymbol> mediaSymbols, Dictionary<MediaSymbol, List<FileFacade>> filesByCabinetMedia, List<FileFacade> uncompressedFiles)
         {
-            var mediaTuplesByDiskId = new Dictionary<int, MediaTuple>();
+            var mediaSymbolsByDiskId = new Dictionary<int, MediaSymbol>();
 
-            if (mediaTuples.Any())
+            if (mediaSymbols.Any())
             {
-                var cabinetMediaTuples = new Dictionary<string, MediaTuple>(StringComparer.OrdinalIgnoreCase);
-                foreach (var mediaTuple in mediaTuples)
+                var cabinetMediaSymbols = new Dictionary<string, MediaSymbol>(StringComparer.OrdinalIgnoreCase);
+                foreach (var mediaSymbol in mediaSymbols)
                 {
                     // If the Media row has a cabinet, make sure it is unique across all Media rows.
-                    if (!String.IsNullOrEmpty(mediaTuple.Cabinet))
+                    if (!String.IsNullOrEmpty(mediaSymbol.Cabinet))
                     {
-                        if (cabinetMediaTuples.TryGetValue(mediaTuple.Cabinet, out var existingRow))
+                        if (cabinetMediaSymbols.TryGetValue(mediaSymbol.Cabinet, out var existingRow))
                         {
-                            this.Messaging.Write(ErrorMessages.DuplicateCabinetName(mediaTuple.SourceLineNumbers, mediaTuple.Cabinet));
+                            this.Messaging.Write(ErrorMessages.DuplicateCabinetName(mediaSymbol.SourceLineNumbers, mediaSymbol.Cabinet));
                             this.Messaging.Write(ErrorMessages.DuplicateCabinetName2(existingRow.SourceLineNumbers, existingRow.Cabinet));
                         }
                         else
                         {
-                            cabinetMediaTuples.Add(mediaTuple.Cabinet, mediaTuple);
+                            cabinetMediaSymbols.Add(mediaSymbol.Cabinet, mediaSymbol);
                         }
 
-                        filesByCabinetMedia.Add(mediaTuple, new List<FileFacade>());
+                        filesByCabinetMedia.Add(mediaSymbol, new List<FileFacade>());
                     }
 
-                    mediaTuplesByDiskId.Add(mediaTuple.DiskId, mediaTuple);
+                    mediaSymbolsByDiskId.Add(mediaSymbol.DiskId, mediaSymbol);
                 }
             }
 
             foreach (var facade in this.FileFacades)
             {
-                if (!mediaTuplesByDiskId.TryGetValue(facade.DiskId, out var mediaTuple))
+                if (!mediaSymbolsByDiskId.TryGetValue(facade.DiskId, out var mediaSymbol))
                 {
                     this.Messaging.Write(ErrorMessages.MissingMedia(facade.SourceLineNumber, facade.DiskId));
                     continue;
@@ -280,7 +280,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 }
                 else // file is marked compressed.
                 {
-                    if (filesByCabinetMedia.TryGetValue(mediaTuple, out var cabinetFiles))
+                    if (filesByCabinetMedia.TryGetValue(mediaSymbol, out var cabinetFiles))
                     {
                         cabinetFiles.Add(facade);
                     }
@@ -293,18 +293,18 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         }
 
         /// <summary>
-        /// Adds a tuple to the section with cab name template filled in.
+        /// Adds a symbol to the section with cab name template filled in.
         /// </summary>
         /// <param name="mediaTable"></param>
         /// <param name="cabIndex"></param>
         /// <returns></returns>
-        private MediaTuple AddMediaTuple(WixMediaTemplateTuple mediaTemplateTuple, int cabIndex)
+        private MediaSymbol AddMediaSymbol(WixMediaTemplateSymbol mediaTemplateSymbol, int cabIndex)
         {
-            return this.Section.AddTuple(new MediaTuple(mediaTemplateTuple.SourceLineNumbers, new Identifier(AccessModifier.Private, cabIndex))
+            return this.Section.AddSymbol(new MediaSymbol(mediaTemplateSymbol.SourceLineNumbers, new Identifier(AccessModifier.Private, cabIndex))
             {
                 DiskId = cabIndex,
                 Cabinet = String.Format(CultureInfo.InvariantCulture, this.CabinetNameTemplate, cabIndex),
-                CompressionLevel = mediaTemplateTuple.CompressionLevel,
+                CompressionLevel = mediaTemplateSymbol.CompressionLevel,
             });
         }
     }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/AttachPatchTransformsCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/AttachPatchTransformsCommand.cs
index a16bafd7..51f1f81a 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/AttachPatchTransformsCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/AttachPatchTransformsCommand.cs
@@ -9,7 +9,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Text.RegularExpressions;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility.Services;
@@ -85,25 +85,25 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             var section = this.Intermediate.Sections.First();
 
-            var tuples = this.Intermediate.Sections.SelectMany(s => s.Tuples).ToList();
+            var symbols = this.Intermediate.Sections.SelectMany(s => s.Symbols).ToList();
 
-            // Get the patch id from the WixPatchId tuple.
-            var patchIdTuple = tuples.OfType<WixPatchIdTuple>().FirstOrDefault();
+            // Get the patch id from the WixPatchId symbol.
+            var patchIdSymbol = symbols.OfType<WixPatchIdSymbol>().FirstOrDefault();
 
-            if (String.IsNullOrEmpty(patchIdTuple.Id?.Id))
+            if (String.IsNullOrEmpty(patchIdSymbol.Id?.Id))
             {
                 this.Messaging.Write(ErrorMessages.ExpectedPatchIdInWixMsp());
                 return subStorages;
             }
 
-            if (String.IsNullOrEmpty(patchIdTuple.ClientPatchId))
+            if (String.IsNullOrEmpty(patchIdSymbol.ClientPatchId))
             {
                 this.Messaging.Write(ErrorMessages.ExpectedClientPatchIdInWixMsp());
                 return subStorages;
             }
 
             // enumerate patch.Media to map diskId to Media row
-            var patchMediaByDiskId = tuples.OfType<MediaTuple>().ToDictionary(t => t.DiskId);
+            var patchMediaByDiskId = symbols.OfType<MediaSymbol>().ToDictionary(t => t.DiskId);
 
             if (patchMediaByDiskId.Count == 0)
             {
@@ -112,23 +112,23 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
 
             // populate MSP summary information
-            var patchMetadata = this.PopulateSummaryInformation(summaryInfo, tuples, patchIdTuple, section.Codepage);
+            var patchMetadata = this.PopulateSummaryInformation(summaryInfo, symbols, patchIdSymbol, section.Codepage);
 
             // enumerate transforms
             var productCodes = new SortedSet<string>();
             var transformNames = new List<string>();
             var validTransform = new List<Tuple<string, WindowsInstallerData>>();
 
-            var baselineTuplesById = tuples.OfType<WixPatchBaselineTuple>().ToDictionary(t => t.Id.Id);
+            var baselineSymbolsById = symbols.OfType<WixPatchBaselineSymbol>().ToDictionary(t => t.Id.Id);
 
             foreach (var mainTransform in this.Transforms)
             {
-                var baselineTuple = baselineTuplesById[mainTransform.Baseline];
+                var baselineSymbol = baselineSymbolsById[mainTransform.Baseline];
 
-                var patchRefTuples = tuples.OfType<WixPatchRefTuple>().ToList();
-                if (patchRefTuples.Count > 0)
+                var patchRefSymbols = symbols.OfType<WixPatchRefSymbol>().ToList();
+                if (patchRefSymbols.Count > 0)
                 {
-                    if (!this.ReduceTransform(mainTransform.Transform, patchRefTuples))
+                    if (!this.ReduceTransform(mainTransform.Transform, patchRefSymbols))
                     {
                         // transform has none of the content authored into this patch
                         continue;
@@ -139,7 +139,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 this.Validate(mainTransform);
 
                 // ensure consistent File.Sequence within each Media
-                var mediaTuple = patchMediaByDiskId[baselineTuple.DiskId];
+                var mediaSymbol = patchMediaByDiskId[baselineSymbol.DiskId];
 
                 // Ensure that files are sequenced after the last file in any transform.
                 var transformMediaTable = mainTransform.Transform.Tables["Media"];
@@ -147,25 +147,25 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 {
                     foreach (MediaRow transformMediaRow in transformMediaTable.Rows)
                     {
-                        if (!mediaTuple.LastSequence.HasValue || mediaTuple.LastSequence < transformMediaRow.LastSequence)
+                        if (!mediaSymbol.LastSequence.HasValue || mediaSymbol.LastSequence < transformMediaRow.LastSequence)
                         {
                             // The Binder will pre-increment the sequence.
-                            mediaTuple.LastSequence = transformMediaRow.LastSequence;
+                            mediaSymbol.LastSequence = transformMediaRow.LastSequence;
                         }
                     }
                 }
 
                 // Use the Media/@DiskId if greater than the last sequence for backward compatibility.
-                if (!mediaTuple.LastSequence.HasValue || mediaTuple.LastSequence < mediaTuple.DiskId)
+                if (!mediaSymbol.LastSequence.HasValue || mediaSymbol.LastSequence < mediaSymbol.DiskId)
                 {
-                    mediaTuple.LastSequence = mediaTuple.DiskId;
+                    mediaSymbol.LastSequence = mediaSymbol.DiskId;
                 }
 
                 // Ignore media table in the transform.
                 mainTransform.Transform.Tables.Remove("Media");
                 mainTransform.Transform.Tables.Remove("MsiDigitalSignature");
 
-                var pairedTransform = this.BuildPairedTransform(summaryInfo, patchMetadata, patchIdTuple, mainTransform.Transform, mediaTuple, baselineTuple, out var productCode);
+                var pairedTransform = this.BuildPairedTransform(summaryInfo, patchMetadata, patchIdSymbol, mainTransform.Transform, mediaSymbol, baselineSymbol, out var productCode);
 
                 productCode = productCode.ToUpperInvariant();
                 productCodes.Add(productCode);
@@ -205,17 +205,17 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
 
             // Finish filling tables with transform-dependent data.
-            productCodes = FinalizePatchProductCodes(tuples, productCodes);
+            productCodes = FinalizePatchProductCodes(symbols, productCodes);
 
             // Semicolon delimited list of the product codes that can accept the patch.
-            summaryInfo.Add(SummaryInformationType.PatchProductCodes, new SummaryInformationTuple(patchIdTuple.SourceLineNumbers)
+            summaryInfo.Add(SummaryInformationType.PatchProductCodes, new SummaryInformationSymbol(patchIdSymbol.SourceLineNumbers)
             {
                 PropertyId = SummaryInformationType.PatchProductCodes,
                 Value = String.Join(";", productCodes)
             });
 
             // Semicolon delimited list of transform substorage names in the order they are applied.
-            summaryInfo.Add(SummaryInformationType.TransformNames, new SummaryInformationTuple(patchIdTuple.SourceLineNumbers)
+            summaryInfo.Add(SummaryInformationType.TransformNames, new SummaryInformationSymbol(patchIdSymbol.SourceLineNumbers)
             {
                 PropertyId = SummaryInformationType.TransformNames,
                 Value = String.Join(";", transformNames)
@@ -224,7 +224,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             // Put the summary information that was extracted back in now that it is updated.
             foreach (var readSummaryInfo in summaryInfo.Values.OrderBy(s => s.PropertyId))
             {
-                section.AddTuple(readSummaryInfo);
+                section.AddSymbol(readSummaryInfo);
             }
 
             this.SubStorages = subStorages;
@@ -232,19 +232,19 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return subStorages;
         }
 
-        private Dictionary<SummaryInformationType, SummaryInformationTuple> ExtractPatchSummaryInfo()
+        private Dictionary<SummaryInformationType, SummaryInformationSymbol> ExtractPatchSummaryInfo()
         {
-            var result = new Dictionary<SummaryInformationType, SummaryInformationTuple>();
+            var result = new Dictionary<SummaryInformationType, SummaryInformationSymbol>();
 
             foreach (var section in this.Intermediate.Sections)
             {
-                for (var i = section.Tuples.Count - 1; i >= 0; i--)
+                for (var i = section.Symbols.Count - 1; i >= 0; i--)
                 {
-                    if (section.Tuples[i] is SummaryInformationTuple patchSummaryInfo)
+                    if (section.Symbols[i] is SummaryInformationSymbol patchSummaryInfo)
                     {
-                        // Remove all summary information from the tuples and remember those that
+                        // Remove all summary information from the symbols and remember those that
                         // are not calculated or reserved.
-                        section.Tuples.RemoveAt(i);
+                        section.Symbols.RemoveAt(i);
 
                         if (patchSummaryInfo.PropertyId != SummaryInformationType.PatchProductCodes &&
                             patchSummaryInfo.PropertyId != SummaryInformationType.PatchCode &&
@@ -262,39 +262,39 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return result;
         }
 
-        private Dictionary<string, MsiPatchMetadataTuple> PopulateSummaryInformation(Dictionary<SummaryInformationType, SummaryInformationTuple> summaryInfo, List<IntermediateTuple> tuples, WixPatchIdTuple patchIdTuple, int codepage)
+        private Dictionary<string, MsiPatchMetadataSymbol> PopulateSummaryInformation(Dictionary<SummaryInformationType, SummaryInformationSymbol> summaryInfo, List<IntermediateSymbol> symbols, WixPatchIdSymbol patchIdSymbol, int codepage)
         {
             // PID_CODEPAGE
             if (!summaryInfo.ContainsKey(SummaryInformationType.Codepage))
             {
                 // Set the code page by default to the same code page for the
                 // string pool in the database.
-                AddSummaryInformation(SummaryInformationType.Codepage, codepage.ToString(CultureInfo.InvariantCulture), patchIdTuple.SourceLineNumbers);
+                AddSummaryInformation(SummaryInformationType.Codepage, codepage.ToString(CultureInfo.InvariantCulture), patchIdSymbol.SourceLineNumbers);
             }
 
             // GUID patch code for the patch.
-            AddSummaryInformation(SummaryInformationType.PatchCode, patchIdTuple.Id.Id, patchIdTuple.SourceLineNumbers);
+            AddSummaryInformation(SummaryInformationType.PatchCode, patchIdSymbol.Id.Id, patchIdSymbol.SourceLineNumbers);
 
             // Indicates the minimum Windows Installer version that is required to install the patch.
-            AddSummaryInformation(SummaryInformationType.PatchInstallerRequirement, ((int)SummaryInformation.InstallerRequirement.Version31).ToString(CultureInfo.InvariantCulture), patchIdTuple.SourceLineNumbers);
+            AddSummaryInformation(SummaryInformationType.PatchInstallerRequirement, ((int)SummaryInformation.InstallerRequirement.Version31).ToString(CultureInfo.InvariantCulture), patchIdSymbol.SourceLineNumbers);
 
             if (!summaryInfo.ContainsKey(SummaryInformationType.Security))
             {
-                AddSummaryInformation(SummaryInformationType.Security, "4", patchIdTuple.SourceLineNumbers); // Read-only enforced;
+                AddSummaryInformation(SummaryInformationType.Security, "4", patchIdSymbol.SourceLineNumbers); // Read-only enforced;
             }
 
             // Use authored comments or default to display name.
-            MsiPatchMetadataTuple commentsTuple = null;
+            MsiPatchMetadataSymbol commentsSymbol = null;
 
-            var metadataTuples = tuples.OfType<MsiPatchMetadataTuple>().Where(t => String.IsNullOrEmpty(t.Company)).ToDictionary(t => t.Property);
+            var metadataSymbols = symbols.OfType<MsiPatchMetadataSymbol>().Where(t => String.IsNullOrEmpty(t.Company)).ToDictionary(t => t.Property);
 
             if (!summaryInfo.ContainsKey(SummaryInformationType.Title) &&
-                metadataTuples.TryGetValue("DisplayName", out var displayName))
+                metadataSymbols.TryGetValue("DisplayName", out var displayName))
             {
                 AddSummaryInformation(SummaryInformationType.Title, displayName.Value, displayName.SourceLineNumbers);
 
                 // Default comments to use display name as-is.
-                commentsTuple = displayName;
+                commentsSymbol = displayName;
             }
 
             // TODO: This code below seems unnecessary given the codepage is set at the top of this method.
@@ -305,38 +305,38 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             //}
 
             if (!summaryInfo.ContainsKey(SummaryInformationType.PatchPackageName) &&
-                metadataTuples.TryGetValue("Description", out var description))
+                metadataSymbols.TryGetValue("Description", out var description))
             {
                 AddSummaryInformation(SummaryInformationType.PatchPackageName, description.Value, description.SourceLineNumbers);
             }
 
             if (!summaryInfo.ContainsKey(SummaryInformationType.Author) &&
-                metadataTuples.TryGetValue("ManufacturerName", out var manufacturer))
+                metadataSymbols.TryGetValue("ManufacturerName", out var manufacturer))
             {
                 AddSummaryInformation(SummaryInformationType.Author, manufacturer.Value, manufacturer.SourceLineNumbers);
             }
 
             // Special metadata marshalled through the build.
-            //var wixMetadataValues = tuples.OfType<WixPatchMetadataTuple>().ToDictionary(t => t.Id.Id, t => t.Value);
+            //var wixMetadataValues = symbols.OfType<WixPatchMetadataSymbol>().ToDictionary(t => t.Id.Id, t => t.Value);
 
             //if (wixMetadataValues.TryGetValue("Comments", out var wixComments))
-            if (metadataTuples.TryGetValue("Comments", out var wixComments))
+            if (metadataSymbols.TryGetValue("Comments", out var wixComments))
             {
-                commentsTuple = wixComments;
+                commentsSymbol = wixComments;
             }
 
             // Write the package comments to summary info.
             if (!summaryInfo.ContainsKey(SummaryInformationType.Comments) &&
-                commentsTuple != null)
+                commentsSymbol != null)
             {
-                AddSummaryInformation(SummaryInformationType.Comments, commentsTuple.Value, commentsTuple.SourceLineNumbers);
+                AddSummaryInformation(SummaryInformationType.Comments, commentsSymbol.Value, commentsSymbol.SourceLineNumbers);
             }
 
-            return metadataTuples;
+            return metadataSymbols;
 
             void AddSummaryInformation(SummaryInformationType type, string value, SourceLineNumber sourceLineNumber)
             {
-                summaryInfo.Add(type, new SummaryInformationTuple(sourceLineNumber)
+                summaryInfo.Add(type, new SummaryInformationSymbol(sourceLineNumber)
                 {
                     PropertyId = type,
                     Value = value
@@ -379,9 +379,9 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// Reduce the transform according to the patch references.
         /// </summary>
         /// <param name="transform">transform generated by torch.</param>
-        /// <param name="patchRefTuples">Table contains patch family filter.</param>
+        /// <param name="patchRefSymbols">Table contains patch family filter.</param>
         /// <returns>true if the transform is not empty</returns>
-        private bool ReduceTransform(WindowsInstallerData transform, IEnumerable<WixPatchRefTuple> patchRefTuples)
+        private bool ReduceTransform(WindowsInstallerData transform, IEnumerable<WixPatchRefSymbol> patchRefSymbols)
         {
             // identify sections to keep
             var oldSections = new Dictionary<string, Row>();
@@ -402,10 +402,10 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             var directoryLockPermissionsIndex = new Dictionary<string, List<Row>>();
             var directoryMsiLockPermissionsExIndex = new Dictionary<string, List<Row>>();
 
-            foreach (var patchRefTuple in patchRefTuples)
+            foreach (var patchRefSymbol in patchRefSymbols)
             {
-                var tableName = patchRefTuple.Table;
-                var key = patchRefTuple.PrimaryKeys;
+                var tableName = patchRefSymbol.Table;
+                var key = patchRefSymbol.PrimaryKeys;
 
                 // Short circuit filtering if all changes should be included.
                 if ("*" == tableName && "*" == key)
@@ -1090,7 +1090,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// <summary>
         /// Create the #transform for the given main transform.
         /// </summary>
-        private WindowsInstallerData BuildPairedTransform(Dictionary<SummaryInformationType, SummaryInformationTuple> summaryInfo, Dictionary<string, MsiPatchMetadataTuple> patchMetadata, WixPatchIdTuple patchIdTuple, WindowsInstallerData mainTransform, MediaTuple mediaTuple, WixPatchBaselineTuple baselineTuple, out string productCode)
+        private WindowsInstallerData BuildPairedTransform(Dictionary<SummaryInformationType, SummaryInformationSymbol> summaryInfo, Dictionary<string, MsiPatchMetadataSymbol> patchMetadata, WixPatchIdSymbol patchIdSymbol, WindowsInstallerData mainTransform, MediaSymbol mediaSymbol, WixPatchBaselineSymbol baselineSymbol, out string productCode)
         {
             productCode = null;
 
@@ -1106,11 +1106,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             var mainSummaryTable = mainTransform.Tables["_SummaryInformation"];
             var mainSummaryRows = mainSummaryTable.Rows.ToDictionary(r => r.FieldAsInteger(0));
 
-            var baselineValidationFlags = ((int)baselineTuple.ValidationFlags).ToString(CultureInfo.InvariantCulture);
+            var baselineValidationFlags = ((int)baselineSymbol.ValidationFlags).ToString(CultureInfo.InvariantCulture);
 
             if (!mainSummaryRows.ContainsKey((int)SummaryInformationType.TransformValidationFlags))
             {
-                var mainSummaryRow = mainSummaryTable.CreateRow(baselineTuple.SourceLineNumbers);
+                var mainSummaryRow = mainSummaryTable.CreateRow(baselineSymbol.SourceLineNumbers);
                 mainSummaryRow[0] = (int)SummaryInformationType.TransformValidationFlags;
                 mainSummaryRow[1] = baselineValidationFlags;
             }
@@ -1177,7 +1177,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     mainFileRow.CopyTo(pairedFileRow);
 
                     // Override authored media for patch bind.
-                    mainFileRow.DiskId = mediaTuple.DiskId;
+                    mainFileRow.DiskId = mediaSymbol.DiskId;
 
                     // Suppress any change to File.Sequence to avoid bloat.
                     mainFileRow.Fields[7].Modified = false;
@@ -1200,78 +1200,78 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             // Add Media row to pairedTransform
             var pairedMediaTable = pairedTransform.EnsureTable(this.tableDefinitions["Media"]);
-            var pairedMediaRow = (MediaRow)pairedMediaTable.CreateRow(mediaTuple.SourceLineNumbers);
+            var pairedMediaRow = (MediaRow)pairedMediaTable.CreateRow(mediaSymbol.SourceLineNumbers);
             pairedMediaRow.Operation = RowOperation.Add;
-            pairedMediaRow.DiskId = mediaTuple.DiskId;
-            pairedMediaRow.LastSequence = mediaTuple.LastSequence ?? 0;
-            pairedMediaRow.DiskPrompt = mediaTuple.DiskPrompt;
-            pairedMediaRow.Cabinet = mediaTuple.Cabinet;
-            pairedMediaRow.VolumeLabel = mediaTuple.VolumeLabel;
-            pairedMediaRow.Source = mediaTuple.Source;
+            pairedMediaRow.DiskId = mediaSymbol.DiskId;
+            pairedMediaRow.LastSequence = mediaSymbol.LastSequence ?? 0;
+            pairedMediaRow.DiskPrompt = mediaSymbol.DiskPrompt;
+            pairedMediaRow.Cabinet = mediaSymbol.Cabinet;
+            pairedMediaRow.VolumeLabel = mediaSymbol.VolumeLabel;
+            pairedMediaRow.Source = mediaSymbol.Source;
 
             // Add PatchPackage for this Media
             var pairedPackageTable = pairedTransform.EnsureTable(this.tableDefinitions["PatchPackage"]);
             pairedPackageTable.Operation = TableOperation.Add;
-            var pairedPackageRow = pairedPackageTable.CreateRow(mediaTuple.SourceLineNumbers);
+            var pairedPackageRow = pairedPackageTable.CreateRow(mediaSymbol.SourceLineNumbers);
             pairedPackageRow.Operation = RowOperation.Add;
-            pairedPackageRow[0] = patchIdTuple.Id.Id;
-            pairedPackageRow[1] = mediaTuple.DiskId;
+            pairedPackageRow[0] = patchIdSymbol.Id.Id;
+            pairedPackageRow[1] = mediaSymbol.DiskId;
 
             // Add the property to the patch transform's Property table.
             var pairedPropertyTable = pairedTransform.EnsureTable(this.tableDefinitions["Property"]);
             pairedPropertyTable.Operation = TableOperation.Add;
 
             // Add property to both identify client patches and whether those patches are removable or not
-            patchMetadata.TryGetValue("AllowRemoval", out var allowRemovalTuple);
+            patchMetadata.TryGetValue("AllowRemoval", out var allowRemovalSymbol);
 
-            var pairedPropertyRow = pairedPropertyTable.CreateRow(allowRemovalTuple?.SourceLineNumbers);
+            var pairedPropertyRow = pairedPropertyTable.CreateRow(allowRemovalSymbol?.SourceLineNumbers);
             pairedPropertyRow.Operation = RowOperation.Add;
-            pairedPropertyRow[0] = String.Concat(patchIdTuple.ClientPatchId, ".AllowRemoval");
-            pairedPropertyRow[1] = allowRemovalTuple?.Value ?? "0";
+            pairedPropertyRow[0] = String.Concat(patchIdSymbol.ClientPatchId, ".AllowRemoval");
+            pairedPropertyRow[1] = allowRemovalSymbol?.Value ?? "0";
 
             // Add this patch code GUID to the patch transform to identify
             // which patches are installed, including in multi-patch
             // installations.
-            pairedPropertyRow = pairedPropertyTable.CreateRow(patchIdTuple.SourceLineNumbers);
+            pairedPropertyRow = pairedPropertyTable.CreateRow(patchIdSymbol.SourceLineNumbers);
             pairedPropertyRow.Operation = RowOperation.Add;
-            pairedPropertyRow[0] = String.Concat(patchIdTuple.ClientPatchId, ".PatchCode");
-            pairedPropertyRow[1] = patchIdTuple.Id.Id;
+            pairedPropertyRow[0] = String.Concat(patchIdSymbol.ClientPatchId, ".PatchCode");
+            pairedPropertyRow[1] = patchIdSymbol.Id.Id;
 
             // Add PATCHNEWPACKAGECODE to apply to admin layouts.
-            pairedPropertyRow = pairedPropertyTable.CreateRow(patchIdTuple.SourceLineNumbers);
+            pairedPropertyRow = pairedPropertyTable.CreateRow(patchIdSymbol.SourceLineNumbers);
             pairedPropertyRow.Operation = RowOperation.Add;
             pairedPropertyRow[0] = "PATCHNEWPACKAGECODE";
-            pairedPropertyRow[1] = patchIdTuple.Id.Id;
+            pairedPropertyRow[1] = patchIdSymbol.Id.Id;
 
             // Add PATCHNEWSUMMARYCOMMENTS and PATCHNEWSUMMARYSUBJECT to apply to admin layouts.
-            if (summaryInfo.TryGetValue(SummaryInformationType.Subject, out var subjectTuple))
+            if (summaryInfo.TryGetValue(SummaryInformationType.Subject, out var subjectSymbol))
             {
-                pairedPropertyRow = pairedPropertyTable.CreateRow(subjectTuple.SourceLineNumbers);
+                pairedPropertyRow = pairedPropertyTable.CreateRow(subjectSymbol.SourceLineNumbers);
                 pairedPropertyRow.Operation = RowOperation.Add;
                 pairedPropertyRow[0] = "PATCHNEWSUMMARYSUBJECT";
-                pairedPropertyRow[1] = subjectTuple.Value;
+                pairedPropertyRow[1] = subjectSymbol.Value;
             }
 
-            if (summaryInfo.TryGetValue(SummaryInformationType.Comments, out var commentsTuple))
+            if (summaryInfo.TryGetValue(SummaryInformationType.Comments, out var commentsSymbol))
             {
-                pairedPropertyRow = pairedPropertyTable.CreateRow(commentsTuple.SourceLineNumbers);
+                pairedPropertyRow = pairedPropertyTable.CreateRow(commentsSymbol.SourceLineNumbers);
                 pairedPropertyRow.Operation = RowOperation.Add;
                 pairedPropertyRow[0] = "PATCHNEWSUMMARYCOMMENTS";
-                pairedPropertyRow[1] = commentsTuple.Value;
+                pairedPropertyRow[1] = commentsSymbol.Value;
             }
 
             return pairedTransform;
         }
 
-        private static SortedSet<string> FinalizePatchProductCodes(List<IntermediateTuple> tuples, SortedSet<string> productCodes)
+        private static SortedSet<string> FinalizePatchProductCodes(List<IntermediateSymbol> symbols, SortedSet<string> productCodes)
         {
-            var patchTargetTuples = tuples.OfType<WixPatchTargetTuple>().ToList();
+            var patchTargetSymbols = symbols.OfType<WixPatchTargetSymbol>().ToList();
 
-            if (patchTargetTuples.Any())
+            if (patchTargetSymbols.Any())
             {
                 var targets = new SortedSet<string>();
                 var replace = true;
-                foreach (var wixPatchTargetRow in patchTargetTuples)
+                foreach (var wixPatchTargetRow in patchTargetSymbols)
                 {
                     var target = wixPatchTargetRow.ProductCode.ToUpperInvariant();
                     if (target == "*")
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/BindDatabaseCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/BindDatabaseCommand.cs
index ea6d49a0..950fe1c1 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/BindDatabaseCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/BindDatabaseCommand.cs
@@ -8,7 +8,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Linq;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility;
     using WixToolset.Extensibility.Data;
@@ -147,7 +147,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             // Add binder variables for all properties.
             if (SectionType.Product == section.Type || variableCache != null)
             {
-                foreach (var propertyRow in section.Tuples.OfType<PropertyTuple>())
+                foreach (var propertyRow in section.Symbols.OfType<PropertySymbol>())
                 {
                     // Set the ProductCode if it is to be generated.
                     if ("ProductCode".Equals(propertyRow.Id.Id, StringComparison.Ordinal) && "*".Equals(propertyRow.Value, StringComparison.Ordinal))
@@ -256,13 +256,13 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             // Retrieve file information from merge modules.
             if (SectionType.Product == section.Type)
             {
-                var wixMergeTuples = section.Tuples.OfType<WixMergeTuple>().ToList();
+                var wixMergeSymbols = section.Symbols.OfType<WixMergeSymbol>().ToList();
 
-                if (wixMergeTuples.Any())
+                if (wixMergeSymbols.Any())
                 {
                     containsMergeModules = true;
 
-                    var command = new ExtractMergeModuleFilesCommand(this.Messaging, wixMergeTuples, fileFacades, installerVersion, this.IntermediateFolder, this.SuppressLayout);
+                    var command = new ExtractMergeModuleFilesCommand(this.Messaging, wixMergeSymbols, fileFacades, installerVersion, this.IntermediateFolder, this.SuppressLayout);
                     command.Execute();
 
                     fileFacades.AddRange(command.MergeModulesFileFacades);
@@ -294,7 +294,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 command.Execute();
             }
 
-#if TODO_FINISH_UPDATE // use tuples instead of rows
+#if TODO_FINISH_UPDATE // use symbols instead of rows
             // Extended binder extensions can be called now that fields are resolved.
             {
                 Table updatedFiles = this.Output.EnsureTable(this.TableDefinitions["WixBindUpdatedFiles"]);
@@ -341,20 +341,20 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 command.Execute();
             }
 
-            // Add missing CreateFolder tuples to null-keypath components.
+            // Add missing CreateFolder symbols to null-keypath components.
             {
                 var command = new AddCreateFoldersCommand(section);
                 command.Execute();
             }
 
-            // Update tuples that reference text files on disk.
+            // Update symbols that reference text files on disk.
             {
                 var command = new UpdateFromTextFilesCommand(this.Messaging, section);
                 command.Execute();
             }
 
             // Assign files to media and update file sequences.
-            Dictionary<MediaTuple, IEnumerable<FileFacade>> filesByCabinetMedia;
+            Dictionary<MediaSymbol, IEnumerable<FileFacade>> filesByCabinetMedia;
             IEnumerable<FileFacade> uncompressedFiles;
             {
                 var order = new OptimizeFileFacadesOrderCommand(fileFacades);
@@ -391,7 +391,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             if (output.Type == OutputType.Module)
             {
                 // Modularize identifiers.
-                var modularize = new ModularizeCommand(output, modularizationSuffix, section.Tuples.OfType<WixSuppressModularizationTuple>());
+                var modularize = new ModularizeCommand(output, modularizationSuffix, section.Symbols.OfType<WixSuppressModularizationSymbol>());
                 modularize.Execute();
 
                 // Ensure all sequence tables in place because, mergemod.dll requires them.
@@ -418,7 +418,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             if (SectionType.Patch == section.Type && this.DeltaBinaryPatch)
             {
-                var command = new CreateDeltaPatchesCommand(fileFacades, this.IntermediateFolder, section.Tuples.OfType<WixPatchIdTuple>().FirstOrDefault());
+                var command = new CreateDeltaPatchesCommand(fileFacades, this.IntermediateFolder, section.Symbols.OfType<WixPatchIdSymbol>().FirstOrDefault());
                 command.Execute();
             }
 
@@ -428,7 +428,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             {
                 this.Messaging.Write(VerboseMessages.CreatingCabinetFiles());
 
-                var mediaTemplate = section.Tuples.OfType<WixMediaTemplateTuple>().FirstOrDefault();
+                var mediaTemplate = section.Symbols.OfType<WixMediaTemplateSymbol>().FirstOrDefault();
 
                 var command = new CreateCabinetsCommand(this.ServiceProvider, this.BackendHelper, mediaTemplate);
                 command.CabbingThreadCount = this.CabbingThreadCount;
@@ -578,7 +578,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return wixout;
         }
 
-        private string ResolveMedia(MediaTuple media, string mediaLayoutDirectory, string layoutDirectory)
+        private string ResolveMedia(MediaSymbol media, string mediaLayoutDirectory, string layoutDirectory)
         {
             string layout = null;
 
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/BindSummaryInfoCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/BindSummaryInfoCommand.cs
index d5806fee..82688edf 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/BindSummaryInfoCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/BindSummaryInfoCommand.cs
@@ -6,7 +6,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Globalization;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
 
     /// <summary>
     /// Binds the summary information table of a database.
@@ -49,13 +49,13 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             var foundCreatingApplication = false;
             var now = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss", CultureInfo.InvariantCulture);
 
-            foreach (var summaryInformationTuple in this.Section.Tuples.OfType<SummaryInformationTuple>())
+            foreach (var summaryInformationSymbol in this.Section.Symbols.OfType<SummaryInformationSymbol>())
             {
-                switch (summaryInformationTuple.PropertyId)
+                switch (summaryInformationSymbol.PropertyId)
                 {
                     case SummaryInformationType.Codepage: // PID_CODEPAGE
                         // make sure the code page is an int and not a web name or null
-                        var codepage = summaryInformationTuple.Value;
+                        var codepage = summaryInformationSymbol.Value;
 
                         if (String.IsNullOrEmpty(codepage))
                         {
@@ -63,11 +63,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         }
                         else
                         {
-                            summaryInformationTuple.Value = Common.GetValidCodePage(codepage, false, false, summaryInformationTuple.SourceLineNumbers).ToString(CultureInfo.InvariantCulture);
+                            summaryInformationSymbol.Value = Common.GetValidCodePage(codepage, false, false, summaryInformationSymbol.SourceLineNumbers).ToString(CultureInfo.InvariantCulture);
                         }
                         break;
                     case SummaryInformationType.PackageCode: // PID_REVNUMBER
-                        var packageCode = summaryInformationTuple.Value;
+                        var packageCode = summaryInformationSymbol.Value;
 
                         if (SectionType.Module == this.Section.Type)
                         {
@@ -76,7 +76,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         else if ("*" == packageCode)
                         {
                             // set the revision number (package/patch code) if it should be automatically generated
-                            summaryInformationTuple.Value = Common.GenerateGuid();
+                            summaryInformationSymbol.Value = Common.GenerateGuid();
                         }
                         break;
                     case SummaryInformationType.Created:
@@ -86,7 +86,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         foundLastSaveDataTime = true;
                         break;
                     case SummaryInformationType.WindowsInstallerVersion:
-                        this.InstallerVersion = summaryInformationTuple[SummaryInformationTupleFields.Value].AsNumber();
+                        this.InstallerVersion = summaryInformationSymbol[SummaryInformationSymbolFields.Value].AsNumber();
                         break;
                     case SummaryInformationType.WordCount:
                         if (SectionType.Patch == this.Section.Type)
@@ -96,7 +96,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         }
                         else
                         {
-                            var attributes = summaryInformationTuple[SummaryInformationTupleFields.Value].AsNumber();
+                            var attributes = summaryInformationSymbol[SummaryInformationSymbolFields.Value].AsNumber();
                             this.LongNames = (0 == (attributes & 1));
                             this.Compressed = (2 == (attributes & 2));
                         }
@@ -110,7 +110,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             // add a summary information row for the create time/date property if its not already set
             if (!foundCreateDataTime)
             {
-                this.Section.AddTuple(new SummaryInformationTuple(null)
+                this.Section.AddSymbol(new SummaryInformationSymbol(null)
                 {
                     PropertyId = SummaryInformationType.Created,
                     Value = now,
@@ -120,7 +120,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             // add a summary information row for the last save time/date property if its not already set
             if (!foundLastSaveDataTime)
             {
-                this.Section.AddTuple(new SummaryInformationTuple(null)
+                this.Section.AddSymbol(new SummaryInformationSymbol(null)
                 {
                     PropertyId = SummaryInformationType.LastSaved,
                     Value = now,
@@ -130,7 +130,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             // add a summary information row for the creating application property if its not already set
             if (!foundCreatingApplication)
             {
-                this.Section.AddTuple(new SummaryInformationTuple(null)
+                this.Section.AddSymbol(new SummaryInformationSymbol(null)
                 {
                     PropertyId = SummaryInformationType.CreatingApplication,
                     Value = String.Format(CultureInfo.InvariantCulture, AppCommon.GetCreatingApplicationString()),
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/BindTransformCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/BindTransformCommand.cs
index ac98c82d..bc5c6853 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/BindTransformCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/BindTransformCommand.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.IO;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility.Services;
 
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CalculateComponentGuids.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CalculateComponentGuids.cs
index 8135ae2e..a1e3ac83 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CalculateComponentGuids.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CalculateComponentGuids.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.IO;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Extensibility.Data;
     using WixToolset.Extensibility.Services;
 
@@ -34,38 +34,38 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            Dictionary<string, RegistryTuple> registryKeyRows = null;
+            Dictionary<string, RegistrySymbol> registryKeyRows = null;
             Dictionary<string, IResolvedDirectory> targetPathsByDirectoryId = null;
             Dictionary<string, string> componentIdGenSeeds = null;
-            Dictionary<string, List<FileTuple>> filesByComponentId = null;
+            Dictionary<string, List<FileSymbol>> filesByComponentId = null;
 
             // Find components with generatable guids.
-            foreach (var componentTuple in this.Section.Tuples.OfType<ComponentTuple>())
+            foreach (var componentSymbol in this.Section.Symbols.OfType<ComponentSymbol>())
             {
                 // Skip components that do not specify generate guid.
-                if (componentTuple.ComponentId != "*")
+                if (componentSymbol.ComponentId != "*")
                 {
                     continue;
                 }
 
-                if (String.IsNullOrEmpty(componentTuple.KeyPath) || ComponentKeyPathType.OdbcDataSource == componentTuple.KeyPathType)
+                if (String.IsNullOrEmpty(componentSymbol.KeyPath) || ComponentKeyPathType.OdbcDataSource == componentSymbol.KeyPathType)
                 {
-                    this.Messaging.Write(ErrorMessages.IllegalComponentWithAutoGeneratedGuid(componentTuple.SourceLineNumbers));
+                    this.Messaging.Write(ErrorMessages.IllegalComponentWithAutoGeneratedGuid(componentSymbol.SourceLineNumbers));
                     continue;
                 }
 
-                if (ComponentKeyPathType.Registry == componentTuple.KeyPathType)
+                if (ComponentKeyPathType.Registry == componentSymbol.KeyPathType)
                 {
                     if (registryKeyRows is null)
                     {
-                        registryKeyRows = this.Section.Tuples.OfType<RegistryTuple>().ToDictionary(t => t.Id.Id);
+                        registryKeyRows = this.Section.Symbols.OfType<RegistrySymbol>().ToDictionary(t => t.Id.Id);
                     }
 
-                    if (registryKeyRows.TryGetValue(componentTuple.KeyPath, out var foundRow))
+                    if (registryKeyRows.TryGetValue(componentSymbol.KeyPath, out var foundRow))
                     {
-                        var bitness = componentTuple.Win64 ? "64" : String.Empty;
+                        var bitness = componentSymbol.Win64 ? "64" : String.Empty;
                         var regkey = String.Concat(bitness, foundRow.AsString(1), "\\", foundRow.AsString(2), "\\", foundRow.AsString(3));
-                        componentTuple.ComponentId = this.BackendHelper.CreateGuid(BindDatabaseCommand.WixComponentGuidNamespace, regkey.ToLowerInvariant());
+                        componentSymbol.ComponentId = this.BackendHelper.CreateGuid(BindDatabaseCommand.WixComponentGuidNamespace, regkey.ToLowerInvariant());
                     }
                 }
                 else // must be a File KeyPath.
@@ -74,7 +74,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     // of directory ids to target names do that now.
                     if (targetPathsByDirectoryId is null)
                     {
-                        var directories = this.Section.Tuples.OfType<DirectoryTuple>().ToList();
+                        var directories = this.Section.Symbols.OfType<DirectorySymbol>().ToList();
 
                         targetPathsByDirectoryId = new Dictionary<string, IResolvedDirectory>(directories.Count);
 
@@ -95,12 +95,12 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     }
 
                     // If the component id generation seeds have not been indexed
-                    // from the Directory tuples do that now.
+                    // from the Directory symbols do that now.
                     if (componentIdGenSeeds is null)
                     {
-                        // If there are any Directory tuples, build up the Component Guid
+                        // If there are any Directory symbols, build up the Component Guid
                         // generation seeds indexed by Directory/@Id.
-                        componentIdGenSeeds = this.Section.Tuples.OfType<DirectoryTuple>()
+                        componentIdGenSeeds = this.Section.Symbols.OfType<DirectorySymbol>()
                             .Where(t => !String.IsNullOrEmpty(t.ComponentGuidGenerationSeed))
                             .ToDictionary(t => t.Id.Id, t => t.ComponentGuidGenerationSeed);
                     }
@@ -109,15 +109,15 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     // then do that now
                     if (filesByComponentId is null)
                     {
-                        var files = this.Section.Tuples.OfType<FileTuple>().ToList();
+                        var files = this.Section.Symbols.OfType<FileSymbol>().ToList();
 
-                        filesByComponentId = new Dictionary<string, List<FileTuple>>(files.Count);
+                        filesByComponentId = new Dictionary<string, List<FileSymbol>>(files.Count);
 
                         foreach (var file in files)
                         {
                             if (!filesByComponentId.TryGetValue(file.ComponentRef, out var componentFiles))
                             {
-                                componentFiles = new List<FileTuple>();
+                                componentFiles = new List<FileSymbol>();
                                 filesByComponentId.Add(file.ComponentRef, componentFiles);
                             }
 
@@ -126,16 +126,16 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     }
 
                     // validate component meets all the conditions to have a generated guid
-                    var currentComponentFiles = filesByComponentId[componentTuple.Id.Id];
+                    var currentComponentFiles = filesByComponentId[componentSymbol.Id.Id];
                     var numFilesInComponent = currentComponentFiles.Count;
                     string path = null;
 
                     foreach (var fileRow in currentComponentFiles)
                     {
-                        if (fileRow.Id.Id == componentTuple.KeyPath)
+                        if (fileRow.Id.Id == componentSymbol.KeyPath)
                         {
                             // calculate the key file's canonical target path
-                            string directoryPath = this.PathResolver.GetDirectoryPath(targetPathsByDirectoryId, componentIdGenSeeds, componentTuple.DirectoryRef, true);
+                            string directoryPath = this.PathResolver.GetDirectoryPath(targetPathsByDirectoryId, componentIdGenSeeds, componentSymbol.DirectoryRef, true);
                             string fileName = Common.GetName(fileRow.Name, false, true).ToLowerInvariant();
                             path = Path.Combine(directoryPath, fileName);
 
@@ -147,13 +147,13 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                                 path.StartsWith(@"StartMenuFolder\programs", StringComparison.Ordinal) ||
                                 path.StartsWith(@"WindowsFolder\fonts", StringComparison.Ordinal))
                             {
-                                this.Messaging.Write(ErrorMessages.IllegalPathForGeneratedComponentGuid(componentTuple.SourceLineNumbers, fileRow.ComponentRef, path));
+                                this.Messaging.Write(ErrorMessages.IllegalPathForGeneratedComponentGuid(componentSymbol.SourceLineNumbers, fileRow.ComponentRef, path));
                             }
 
                             // if component has more than one file, the key path must be versioned
                             if (1 < numFilesInComponent && String.IsNullOrEmpty(fileRow.Version))
                             {
-                                this.Messaging.Write(ErrorMessages.IllegalGeneratedGuidComponentUnversionedKeypath(componentTuple.SourceLineNumbers));
+                                this.Messaging.Write(ErrorMessages.IllegalGeneratedGuidComponentUnversionedKeypath(componentSymbol.SourceLineNumbers));
                             }
                         }
                         else
@@ -161,7 +161,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                             // not a key path, so it must be an unversioned file if component has more than one file
                             if (1 < numFilesInComponent && !String.IsNullOrEmpty(fileRow.Version))
                             {
-                                this.Messaging.Write(ErrorMessages.IllegalGeneratedGuidComponentVersionedNonkeypath(componentTuple.SourceLineNumbers));
+                                this.Messaging.Write(ErrorMessages.IllegalGeneratedGuidComponentVersionedNonkeypath(componentSymbol.SourceLineNumbers));
                             }
                         }
                     }
@@ -169,7 +169,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     // if the rules were followed, reward with a generated guid
                     if (!this.Messaging.EncounteredError)
                     {
-                        componentTuple.ComponentId = this.BackendHelper.CreateGuid(BindDatabaseCommand.WixComponentGuidNamespace, path);
+                        componentSymbol.ComponentId = this.BackendHelper.CreateGuid(BindDatabaseCommand.WixComponentGuidNamespace, path);
                     }
                 }
             }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CopyTransformDataCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CopyTransformDataCommand.cs
index 0dcce61b..8a85a975 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CopyTransformDataCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CopyTransformDataCommand.cs
@@ -11,7 +11,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Linq;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility;
@@ -463,9 +463,9 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     ref duplicateFilesSequence);
             if (!hasPatchFilesAction)
             {
-                WindowsInstallerStandard.TryGetStandardAction(tableName, "PatchFiles", out var patchFilesActionTuple);
+                WindowsInstallerStandard.TryGetStandardAction(tableName, "PatchFiles", out var patchFilesActionSymbol);
 
-                var sequence = patchFilesActionTuple.Sequence;
+                var sequence = patchFilesActionSymbol.Sequence;
 
                 // Test for default sequence value's appropriateness
                 if (installFilesSequence >= sequence || (0 != duplicateFilesSequence && duplicateFilesSequence <= sequence))
@@ -474,14 +474,14 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     {
                         if (duplicateFilesSequence < installFilesSequence)
                         {
-                            throw new WixException(ErrorMessages.InsertInvalidSequenceActionOrder(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionTuple.Action));
+                            throw new WixException(ErrorMessages.InsertInvalidSequenceActionOrder(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionSymbol.Action));
                         }
                         else
                         {
                             sequence = (duplicateFilesSequence + installFilesSequence) / 2;
                             if (installFilesSequence == sequence || duplicateFilesSequence == sequence)
                             {
-                                throw new WixException(ErrorMessages.InsertSequenceNoSpace(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionTuple.Action));
+                                throw new WixException(ErrorMessages.InsertSequenceNoSpace(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionSymbol.Action));
                             }
                         }
                     }
@@ -498,8 +498,8 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 }
 
                 var patchAction = sequenceTable.CreateRow(null);
-                patchAction[0] = patchFilesActionTuple.Action;
-                patchAction[1] = patchFilesActionTuple.Condition;
+                patchAction[0] = patchFilesActionSymbol.Action;
+                patchAction[1] = patchFilesActionSymbol.Condition;
                 patchAction[2] = sequence;
                 patchAction.Operation = RowOperation.Add;
             }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CreateCabinetsCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CreateCabinetsCommand.cs
index 9741fcd9..5c296f74 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CreateCabinetsCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CreateCabinetsCommand.cs
@@ -10,7 +10,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Runtime.InteropServices;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility;
     using WixToolset.Extensibility.Data;
@@ -32,7 +32,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         private Dictionary<string, string> lastCabinetAddedToMediaTable; // Key is First Cabinet Name, Value is Last Cabinet Added in the Split Sequence
 
-        public CreateCabinetsCommand(IWixToolsetServiceProvider serviceProvider, IBackendHelper backendHelper, WixMediaTemplateTuple mediaTemplate)
+        public CreateCabinetsCommand(IWixToolsetServiceProvider serviceProvider, IBackendHelper backendHelper, WixMediaTemplateSymbol mediaTemplate)
         {
             this.fileTransfers = new List<IFileTransfer>();
 
@@ -51,7 +51,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         private IBackendHelper BackendHelper { get; }
 
-        private WixMediaTemplateTuple MediaTemplate { get; }
+        private WixMediaTemplateSymbol MediaTemplate { get; }
 
         /// <summary>
         /// Sets the number of threads to use for cabinet creation.
@@ -80,9 +80,9 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public string ModularizationSuffix { private get; set; }
 
-        public Dictionary<MediaTuple, IEnumerable<FileFacade>> FileFacadesByCabinet { private get; set; }
+        public Dictionary<MediaSymbol, IEnumerable<FileFacade>> FileFacadesByCabinet { private get; set; }
 
-        public Func<MediaTuple, string, string, string> ResolveMedia { private get; set; }
+        public Func<MediaSymbol, string, string, string> ResolveMedia { private get; set; }
 
         public TableDefinitionCollection TableDefinitions { private get; set; }
 
@@ -113,12 +113,12 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             foreach (var entry in this.FileFacadesByCabinet)
             {
-                var mediaTuple = entry.Key;
+                var mediaSymbol = entry.Key;
                 var files = entry.Value;
-                var compressionLevel = mediaTuple.CompressionLevel ?? this.DefaultCompressionLevel ?? CompressionLevel.Medium;
-                var cabinetDir = this.ResolveMedia(mediaTuple, mediaTuple.Layout, this.LayoutDirectory);
+                var compressionLevel = mediaSymbol.CompressionLevel ?? this.DefaultCompressionLevel ?? CompressionLevel.Medium;
+                var cabinetDir = this.ResolveMedia(mediaSymbol, mediaSymbol.Layout, this.LayoutDirectory);
 
-                var cabinetWorkItem = this.CreateCabinetWorkItem(this.Output, cabinetDir, mediaTuple, compressionLevel, files);
+                var cabinetWorkItem = this.CreateCabinetWorkItem(this.Output, cabinetDir, mediaSymbol, compressionLevel, files);
                 if (null != cabinetWorkItem)
                 {
                     cabinetBuilder.Enqueue(cabinetWorkItem);
@@ -176,28 +176,28 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// </summary>
         /// <param name="output">Output for the current database.</param>
         /// <param name="cabinetDir">Directory to create cabinet in.</param>
-        /// <param name="mediaTuple">Media tuple containing information about the cabinet.</param>
+        /// <param name="mediaSymbol">Media symbol containing information about the cabinet.</param>
         /// <param name="fileFacades">Collection of files in this cabinet.</param>
         /// <returns>created CabinetWorkItem object</returns>
-        private CabinetWorkItem CreateCabinetWorkItem(WindowsInstallerData output, string cabinetDir, MediaTuple mediaTuple, CompressionLevel compressionLevel, IEnumerable<FileFacade> fileFacades)
+        private CabinetWorkItem CreateCabinetWorkItem(WindowsInstallerData output, string cabinetDir, MediaSymbol mediaSymbol, CompressionLevel compressionLevel, IEnumerable<FileFacade> fileFacades)
         {
             CabinetWorkItem cabinetWorkItem = null;
-            var tempCabinetFileX = Path.Combine(this.IntermediateFolder, mediaTuple.Cabinet);
+            var tempCabinetFileX = Path.Combine(this.IntermediateFolder, mediaSymbol.Cabinet);
 
             // check for an empty cabinet
             if (!fileFacades.Any())
             {
                 // Remove the leading '#' from the embedded cabinet name to make the warning easier to understand
-                var cabinetName = mediaTuple.Cabinet.TrimStart('#');
+                var cabinetName = mediaSymbol.Cabinet.TrimStart('#');
 
                 // If building a patch, remind them to run -p for torch.
                 if (OutputType.Patch == output.Type)
                 {
-                    this.Messaging.Write(WarningMessages.EmptyCabinet(mediaTuple.SourceLineNumbers, cabinetName, true));
+                    this.Messaging.Write(WarningMessages.EmptyCabinet(mediaSymbol.SourceLineNumbers, cabinetName, true));
                 }
                 else
                 {
-                    this.Messaging.Write(WarningMessages.EmptyCabinet(mediaTuple.SourceLineNumbers, cabinetName));
+                    this.Messaging.Write(WarningMessages.EmptyCabinet(mediaSymbol.SourceLineNumbers, cabinetName));
                 }
             }
 
@@ -213,7 +213,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
             else // reuse the cabinet from the cabinet cache.
             {
-                this.Messaging.Write(VerboseMessages.ReusingCabCache(mediaTuple.SourceLineNumbers, mediaTuple.Cabinet, resolvedCabinet.Path));
+                this.Messaging.Write(VerboseMessages.ReusingCabCache(mediaSymbol.SourceLineNumbers, mediaSymbol.Cabinet, resolvedCabinet.Path));
 
                 try
                 {
@@ -227,27 +227,27 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 }
                 catch (Exception e)
                 {
-                    this.Messaging.Write(WarningMessages.CannotUpdateCabCache(mediaTuple.SourceLineNumbers, resolvedCabinet.Path, e.Message));
+                    this.Messaging.Write(WarningMessages.CannotUpdateCabCache(mediaSymbol.SourceLineNumbers, resolvedCabinet.Path, e.Message));
                 }
             }
 
-            var trackResolvedCabinet = this.BackendHelper.TrackFile(resolvedCabinet.Path, TrackedFileType.Intermediate, mediaTuple.SourceLineNumbers);
+            var trackResolvedCabinet = this.BackendHelper.TrackFile(resolvedCabinet.Path, TrackedFileType.Intermediate, mediaSymbol.SourceLineNumbers);
             this.trackedFiles.Add(trackResolvedCabinet);
 
-            if (mediaTuple.Cabinet.StartsWith("#", StringComparison.Ordinal))
+            if (mediaSymbol.Cabinet.StartsWith("#", StringComparison.Ordinal))
             {
                 var streamsTable = output.EnsureTable(this.TableDefinitions["_Streams"]);
 
-                var streamRow = streamsTable.CreateRow(mediaTuple.SourceLineNumbers);
-                streamRow[0] = mediaTuple.Cabinet.Substring(1);
+                var streamRow = streamsTable.CreateRow(mediaSymbol.SourceLineNumbers);
+                streamRow[0] = mediaSymbol.Cabinet.Substring(1);
                 streamRow[1] = resolvedCabinet.Path;
             }
             else
             {
-                var trackDestination = this.BackendHelper.TrackFile(Path.Combine(cabinetDir, mediaTuple.Cabinet), TrackedFileType.Final, mediaTuple.SourceLineNumbers);
+                var trackDestination = this.BackendHelper.TrackFile(Path.Combine(cabinetDir, mediaSymbol.Cabinet), TrackedFileType.Final, mediaSymbol.SourceLineNumbers);
                 this.trackedFiles.Add(trackDestination);
 
-                var transfer = this.BackendHelper.CreateFileTransfer(resolvedCabinet.Path, trackDestination.Path, resolvedCabinet.BuildOption == CabinetBuildOption.BuildAndMove, mediaTuple.SourceLineNumbers);
+                var transfer = this.BackendHelper.CreateFileTransfer(resolvedCabinet.Path, trackDestination.Path, resolvedCabinet.BuildOption == CabinetBuildOption.BuildAndMove, mediaSymbol.SourceLineNumbers);
                 this.fileTransfers.Add(transfer);
             }
 
@@ -372,7 +372,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 }
 
                 // The new Row has to be inserted just after the last cab in this cabinet split chain according to DiskID Sort
-                // This is because the FDI Extract requires DiskID of Split Cabinets to be continuous. It Fails otherwise with 
+                // This is because the FDI Extract requires DiskID of Split Cabinets to be continuous. It Fails otherwise with
                 // Error 2350 (FDI Server Error) as next DiskID did not have the right split cabinet during extraction
                 MediaRow newMediaRow = (MediaRow)mediaTable.CreateRow(null);
                 newMediaRow.Cabinet = newCabinetName;
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CreateDeltaPatchesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CreateDeltaPatchesCommand.cs
index c54e9c53..93ac50ff 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CreateDeltaPatchesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CreateDeltaPatchesCommand.cs
@@ -8,14 +8,14 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.IO;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
 
     /// <summary>
     /// Creates delta patches and updates the appropriate rows to point to the newly generated patches.
     /// </summary>
     internal class CreateDeltaPatchesCommand
     {
-        public CreateDeltaPatchesCommand(List<FileFacade> fileFacades, string intermediateFolder, WixPatchIdTuple wixPatchId)
+        public CreateDeltaPatchesCommand(List<FileFacade> fileFacades, string intermediateFolder, WixPatchIdSymbol wixPatchId)
         {
             this.FileFacades = fileFacades;
             this.IntermediateFolder = intermediateFolder;
@@ -24,7 +24,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         private IEnumerable<FileFacade> FileFacades { get; }
 
-        private WixPatchIdTuple WixPatchId { get; }
+        private WixPatchIdSymbol WixPatchId { get; }
 
         private string IntermediateFolder { get; }
 
@@ -73,7 +73,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     }
                 }
             }
-#endif 
+#endif
 
             throw new NotImplementedException();
         }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CreateInstanceTransformsCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CreateInstanceTransformsCommand.cs
index 772100ca..33afca77 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CreateInstanceTransformsCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CreateInstanceTransformsCommand.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Linq;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility.Services;
@@ -33,9 +33,9 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         public void Execute()
         {
             // Create and add substorages for instance transforms.
-            var wixInstanceTransformsTuples = this.Section.Tuples.OfType<WixInstanceTransformsTuple>();
+            var wixInstanceTransformsSymbols = this.Section.Symbols.OfType<WixInstanceTransformsSymbol>();
 
-            if (wixInstanceTransformsTuples.Any())
+            if (wixInstanceTransformsSymbols.Any())
             {
                 string targetProductCode = null;
                 string targetUpgradeCode = null;
@@ -62,7 +62,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 }
 
                 // Index the Instance Component Rows, we'll get the Components rows from the real Component table.
-                var targetInstanceComponentTable = this.Section.Tuples.OfType<WixInstanceComponentTuple>();
+                var targetInstanceComponentTable = this.Section.Symbols.OfType<WixInstanceComponentSymbol>();
                 var instanceComponentGuids = targetInstanceComponentTable.ToDictionary(t => t.Id.Id, t => (ComponentRow)null);
 
                 if (instanceComponentGuids.Any())
@@ -79,11 +79,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 }
 
                 // Generate the instance transforms
-                foreach (var instanceTuple in wixInstanceTransformsTuples)
+                foreach (var instanceSymbol in wixInstanceTransformsSymbols)
                 {
-                    var instanceId = instanceTuple.Id.Id;
+                    var instanceId = instanceSymbol.Id.Id;
 
-                    var instanceTransform = new WindowsInstallerData(instanceTuple.SourceLineNumbers);
+                    var instanceTransform = new WindowsInstallerData(instanceSymbol.SourceLineNumbers);
                     instanceTransform.Type = OutputType.Transform;
                     instanceTransform.Codepage = this.Output.Codepage;
 
@@ -107,49 +107,49 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     var propertyTable = instanceTransform.EnsureTable(this.TableDefinitions["Property"]);
 
                     // Change the ProductCode property
-                    var productCode = instanceTuple.ProductCode;
+                    var productCode = instanceSymbol.ProductCode;
                     if ("*" == productCode)
                     {
                         productCode = Common.GenerateGuid();
                     }
 
-                    var productCodeRow = propertyTable.CreateRow(instanceTuple.SourceLineNumbers);
+                    var productCodeRow = propertyTable.CreateRow(instanceSymbol.SourceLineNumbers);
                     productCodeRow.Operation = RowOperation.Modify;
                     productCodeRow.Fields[1].Modified = true;
                     productCodeRow[0] = "ProductCode";
                     productCodeRow[1] = productCode;
 
                     // Change the instance property
-                    var instanceIdRow = propertyTable.CreateRow(instanceTuple.SourceLineNumbers);
+                    var instanceIdRow = propertyTable.CreateRow(instanceSymbol.SourceLineNumbers);
                     instanceIdRow.Operation = RowOperation.Modify;
                     instanceIdRow.Fields[1].Modified = true;
-                    instanceIdRow[0] = instanceTuple.PropertyId;
+                    instanceIdRow[0] = instanceSymbol.PropertyId;
                     instanceIdRow[1] = instanceId;
 
-                    if (!String.IsNullOrEmpty(instanceTuple.ProductName))
+                    if (!String.IsNullOrEmpty(instanceSymbol.ProductName))
                     {
                         // Change the ProductName property
-                        var productNameRow = propertyTable.CreateRow(instanceTuple.SourceLineNumbers);
+                        var productNameRow = propertyTable.CreateRow(instanceSymbol.SourceLineNumbers);
                         productNameRow.Operation = RowOperation.Modify;
                         productNameRow.Fields[1].Modified = true;
                         productNameRow[0] = "ProductName";
-                        productNameRow[1] = instanceTuple.ProductName;
+                        productNameRow[1] = instanceSymbol.ProductName;
                     }
 
-                    if (!String.IsNullOrEmpty(instanceTuple.UpgradeCode))
+                    if (!String.IsNullOrEmpty(instanceSymbol.UpgradeCode))
                     {
                         // Change the UpgradeCode property
-                        var upgradeCodeRow = propertyTable.CreateRow(instanceTuple.SourceLineNumbers);
+                        var upgradeCodeRow = propertyTable.CreateRow(instanceSymbol.SourceLineNumbers);
                         upgradeCodeRow.Operation = RowOperation.Modify;
                         upgradeCodeRow.Fields[1].Modified = true;
                         upgradeCodeRow[0] = "UpgradeCode";
-                        upgradeCodeRow[1] = instanceTuple.UpgradeCode;
+                        upgradeCodeRow[1] = instanceSymbol.UpgradeCode;
 
                         // Change the Upgrade table
                         var targetUpgradeTable = this.Output.Tables["Upgrade"];
                         if (null != targetUpgradeTable && 0 <= targetUpgradeTable.Rows.Count)
                         {
-                            var upgradeId = instanceTuple.UpgradeCode;
+                            var upgradeId = instanceSymbol.UpgradeCode;
                             var upgradeTable = instanceTransform.EnsureTable(this.TableDefinitions["Upgrade"]);
                             foreach (var row in targetUpgradeTable.Rows)
                             {
@@ -235,19 +235,19 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
                     if (!summaryRows.ContainsKey((int)SummaryInformation.Transform.UpdatedPlatformAndLanguage))
                     {
-                        var summaryRow = instanceSummaryInformationTable.CreateRow(instanceTuple.SourceLineNumbers);
+                        var summaryRow = instanceSummaryInformationTable.CreateRow(instanceSymbol.SourceLineNumbers);
                         summaryRow[0] = (int)SummaryInformation.Transform.UpdatedPlatformAndLanguage;
                         summaryRow[1] = targetPlatformAndLanguage;
                     }
                     else if (!summaryRows.ContainsKey((int)SummaryInformation.Transform.ValidationFlags))
                     {
-                        var summaryRow = instanceSummaryInformationTable.CreateRow(instanceTuple.SourceLineNumbers);
+                        var summaryRow = instanceSummaryInformationTable.CreateRow(instanceSymbol.SourceLineNumbers);
                         summaryRow[0] = (int)SummaryInformation.Transform.ValidationFlags;
                         summaryRow[1] = "0";
                     }
                     else if (!summaryRows.ContainsKey((int)SummaryInformation.Transform.Security))
                     {
-                        var summaryRow = instanceSummaryInformationTable.CreateRow(instanceTuple.SourceLineNumbers);
+                        var summaryRow = instanceSummaryInformationTable.CreateRow(instanceSymbol.SourceLineNumbers);
                         summaryRow[0] = (int)SummaryInformation.Transform.Security;
                         summaryRow[1] = "4";
                     }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CreateOutputFromIRCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CreateOutputFromIRCommand.cs
index 90d1c148..052b30e3 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CreateOutputFromIRCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CreateOutputFromIRCommand.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Globalization;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility;
@@ -38,7 +38,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            this.Output = new WindowsInstallerData(this.Section.Tuples.First().SourceLineNumbers)
+            this.Output = new WindowsInstallerData(this.Section.Symbols.First().SourceLineNumbers)
             {
                 Codepage = this.Section.Codepage,
                 Type = SectionTypeToOutputType(this.Section.Type)
@@ -49,388 +49,388 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         private void AddSectionToOutput()
         {
-            var cellsByTableAndRowId = new Dictionary<string, List<WixCustomTableCellTuple>>();
+            var cellsByTableAndRowId = new Dictionary<string, List<WixCustomTableCellSymbol>>();
 
-            foreach (var tuple in this.Section.Tuples)
+            foreach (var symbol in this.Section.Symbols)
             {
-                var unknownTuple = false;
-                switch (tuple.Definition.Type)
+                var unknownSymbol = false;
+                switch (symbol.Definition.Type)
                 {
-                    case TupleDefinitionType.AppSearch:
-                        this.AddTupleDefaultly(tuple);
+                    case SymbolDefinitionType.AppSearch:
+                        this.AddSymbolDefaultly(symbol);
                         this.Output.EnsureTable(this.TableDefinitions["Signature"]);
                         break;
 
-                    case TupleDefinitionType.Assembly:
-                        this.AddAssemblyTuple((AssemblyTuple)tuple);
+                    case SymbolDefinitionType.Assembly:
+                        this.AddAssemblySymbol((AssemblySymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.BBControl:
-                        this.AddBBControlTuple((BBControlTuple)tuple);
+                    case SymbolDefinitionType.BBControl:
+                        this.AddBBControlSymbol((BBControlSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Class:
-                        this.AddClassTuple((ClassTuple)tuple);
+                    case SymbolDefinitionType.Class:
+                        this.AddClassSymbol((ClassSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Control:
-                        this.AddControlTuple((ControlTuple)tuple);
+                    case SymbolDefinitionType.Control:
+                        this.AddControlSymbol((ControlSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Component:
-                        this.AddComponentTuple((ComponentTuple)tuple);
+                    case SymbolDefinitionType.Component:
+                        this.AddComponentSymbol((ComponentSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.CustomAction:
-                        this.AddCustomActionTuple((CustomActionTuple)tuple);
+                    case SymbolDefinitionType.CustomAction:
+                        this.AddCustomActionSymbol((CustomActionSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Dialog:
-                        this.AddDialogTuple((DialogTuple)tuple);
+                    case SymbolDefinitionType.Dialog:
+                        this.AddDialogSymbol((DialogSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Directory:
-                        this.AddDirectoryTuple((DirectoryTuple)tuple);
+                    case SymbolDefinitionType.Directory:
+                        this.AddDirectorySymbol((DirectorySymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Environment:
-                        this.AddEnvironmentTuple((EnvironmentTuple)tuple);
+                    case SymbolDefinitionType.Environment:
+                        this.AddEnvironmentSymbol((EnvironmentSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Error:
-                        this.AddErrorTuple((ErrorTuple)tuple);
+                    case SymbolDefinitionType.Error:
+                        this.AddErrorSymbol((ErrorSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Feature:
-                        this.AddFeatureTuple((FeatureTuple)tuple);
+                    case SymbolDefinitionType.Feature:
+                        this.AddFeatureSymbol((FeatureSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.File:
-                        this.AddFileTuple((FileTuple)tuple);
+                    case SymbolDefinitionType.File:
+                        this.AddFileSymbol((FileSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.IniFile:
-                        this.AddIniFileTuple((IniFileTuple)tuple);
+                    case SymbolDefinitionType.IniFile:
+                        this.AddIniFileSymbol((IniFileSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Media:
-                        this.AddMediaTuple((MediaTuple)tuple);
+                    case SymbolDefinitionType.Media:
+                        this.AddMediaSymbol((MediaSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.ModuleConfiguration:
-                        this.AddModuleConfigurationTuple((ModuleConfigurationTuple)tuple);
+                    case SymbolDefinitionType.ModuleConfiguration:
+                        this.AddModuleConfigurationSymbol((ModuleConfigurationSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.MsiEmbeddedUI:
-                        this.AddMsiEmbeddedUITuple((MsiEmbeddedUITuple)tuple);
+                    case SymbolDefinitionType.MsiEmbeddedUI:
+                        this.AddMsiEmbeddedUISymbol((MsiEmbeddedUISymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.MsiServiceConfig:
-                        this.AddMsiServiceConfigTuple((MsiServiceConfigTuple)tuple);
+                    case SymbolDefinitionType.MsiServiceConfig:
+                        this.AddMsiServiceConfigSymbol((MsiServiceConfigSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.MsiServiceConfigFailureActions:
-                        this.AddMsiServiceConfigFailureActionsTuple((MsiServiceConfigFailureActionsTuple)tuple);
+                    case SymbolDefinitionType.MsiServiceConfigFailureActions:
+                        this.AddMsiServiceConfigFailureActionsSymbol((MsiServiceConfigFailureActionsSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.MoveFile:
-                        this.AddMoveFileTuple((MoveFileTuple)tuple);
+                    case SymbolDefinitionType.MoveFile:
+                        this.AddMoveFileSymbol((MoveFileSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.ProgId:
-                        this.AddTupleDefaultly(tuple);
+                    case SymbolDefinitionType.ProgId:
+                        this.AddSymbolDefaultly(symbol);
                         this.Output.EnsureTable(this.TableDefinitions["Extension"]);
                         break;
 
-                    case TupleDefinitionType.Property:
-                        this.AddPropertyTuple((PropertyTuple)tuple);
+                    case SymbolDefinitionType.Property:
+                        this.AddPropertySymbol((PropertySymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.RemoveFile:
-                        this.AddRemoveFileTuple((RemoveFileTuple)tuple);
+                    case SymbolDefinitionType.RemoveFile:
+                        this.AddRemoveFileSymbol((RemoveFileSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Registry:
-                        this.AddRegistryTuple((RegistryTuple)tuple);
+                    case SymbolDefinitionType.Registry:
+                        this.AddRegistrySymbol((RegistrySymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.RegLocator:
-                        this.AddRegLocatorTuple((RegLocatorTuple)tuple);
+                    case SymbolDefinitionType.RegLocator:
+                        this.AddRegLocatorSymbol((RegLocatorSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.RemoveRegistry:
-                        this.AddRemoveRegistryTuple((RemoveRegistryTuple)tuple);
+                    case SymbolDefinitionType.RemoveRegistry:
+                        this.AddRemoveRegistrySymbol((RemoveRegistrySymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.ServiceControl:
-                        this.AddServiceControlTuple((ServiceControlTuple)tuple);
+                    case SymbolDefinitionType.ServiceControl:
+                        this.AddServiceControlSymbol((ServiceControlSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.ServiceInstall:
-                        this.AddServiceInstallTuple((ServiceInstallTuple)tuple);
+                    case SymbolDefinitionType.ServiceInstall:
+                        this.AddServiceInstallSymbol((ServiceInstallSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Shortcut:
-                        this.AddShortcutTuple((ShortcutTuple)tuple);
+                    case SymbolDefinitionType.Shortcut:
+                        this.AddShortcutSymbol((ShortcutSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.TextStyle:
-                        this.AddTextStyleTuple((TextStyleTuple)tuple);
+                    case SymbolDefinitionType.TextStyle:
+                        this.AddTextStyleSymbol((TextStyleSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.Upgrade:
-                        this.AddUpgradeTuple((UpgradeTuple)tuple);
+                    case SymbolDefinitionType.Upgrade:
+                        this.AddUpgradeSymbol((UpgradeSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.WixAction:
-                        this.AddWixActionTuple((WixActionTuple)tuple);
+                    case SymbolDefinitionType.WixAction:
+                        this.AddWixActionSymbol((WixActionSymbol)symbol);
                         break;
 
-                    case TupleDefinitionType.WixCustomTableCell:
-                        this.IndexCustomTableCellTuple((WixCustomTableCellTuple)tuple, cellsByTableAndRowId);
+                    case SymbolDefinitionType.WixCustomTableCell:
+                        this.IndexCustomTableCellSymbol((WixCustomTableCellSymbol)symbol, cellsByTableAndRowId);
                         break;
 
-                    case TupleDefinitionType.WixEnsureTable:
-                        this.AddWixEnsureTableTuple((WixEnsureTableTuple)tuple);
+                    case SymbolDefinitionType.WixEnsureTable:
+                        this.AddWixEnsureTableSymbol((WixEnsureTableSymbol)symbol);
                         break;
 
-                    // Tuples used internally and are not added to the output.
-                    case TupleDefinitionType.WixBuildInfo:
-                    case TupleDefinitionType.WixBindUpdatedFiles:
-                    case TupleDefinitionType.WixComponentGroup:
-                    case TupleDefinitionType.WixComplexReference:
-                    case TupleDefinitionType.WixDeltaPatchFile:
-                    case TupleDefinitionType.WixDeltaPatchSymbolPaths:
-                    case TupleDefinitionType.WixFragment:
-                    case TupleDefinitionType.WixFeatureGroup:
-                    case TupleDefinitionType.WixInstanceComponent:
-                    case TupleDefinitionType.WixInstanceTransforms:
-                    case TupleDefinitionType.WixFeatureModules:
-                    case TupleDefinitionType.WixGroup:
-                    case TupleDefinitionType.WixMediaTemplate:
-                    case TupleDefinitionType.WixMerge:
-                    case TupleDefinitionType.WixOrdering:
-                    case TupleDefinitionType.WixPatchBaseline:
-                    case TupleDefinitionType.WixPatchFamilyGroup:
-                    case TupleDefinitionType.WixPatchId:
-                    case TupleDefinitionType.WixPatchRef:
-                    case TupleDefinitionType.WixPatchTarget:
-                    case TupleDefinitionType.WixProperty:
-                    case TupleDefinitionType.WixSimpleReference:
-                    case TupleDefinitionType.WixSuppressAction:
-                    case TupleDefinitionType.WixSuppressModularization:
-                    case TupleDefinitionType.WixUI:
-                    case TupleDefinitionType.WixVariable:
+                    // Symbols used internally and are not added to the output.
+                    case SymbolDefinitionType.WixBuildInfo:
+                    case SymbolDefinitionType.WixBindUpdatedFiles:
+                    case SymbolDefinitionType.WixComponentGroup:
+                    case SymbolDefinitionType.WixComplexReference:
+                    case SymbolDefinitionType.WixDeltaPatchFile:
+                    case SymbolDefinitionType.WixDeltaPatchSymbolPaths:
+                    case SymbolDefinitionType.WixFragment:
+                    case SymbolDefinitionType.WixFeatureGroup:
+                    case SymbolDefinitionType.WixInstanceComponent:
+                    case SymbolDefinitionType.WixInstanceTransforms:
+                    case SymbolDefinitionType.WixFeatureModules:
+                    case SymbolDefinitionType.WixGroup:
+                    case SymbolDefinitionType.WixMediaTemplate:
+                    case SymbolDefinitionType.WixMerge:
+                    case SymbolDefinitionType.WixOrdering:
+                    case SymbolDefinitionType.WixPatchBaseline:
+                    case SymbolDefinitionType.WixPatchFamilyGroup:
+                    case SymbolDefinitionType.WixPatchId:
+                    case SymbolDefinitionType.WixPatchRef:
+                    case SymbolDefinitionType.WixPatchTarget:
+                    case SymbolDefinitionType.WixProperty:
+                    case SymbolDefinitionType.WixSimpleReference:
+                    case SymbolDefinitionType.WixSuppressAction:
+                    case SymbolDefinitionType.WixSuppressModularization:
+                    case SymbolDefinitionType.WixUI:
+                    case SymbolDefinitionType.WixVariable:
                         break;
 
                     // Already processed by LoadTableDefinitions.
-                    case TupleDefinitionType.WixCustomTable:
-                    case TupleDefinitionType.WixCustomTableColumn:
+                    case SymbolDefinitionType.WixCustomTable:
+                    case SymbolDefinitionType.WixCustomTableColumn:
                         break;
 
-                    case TupleDefinitionType.MustBeFromAnExtension:
-                        unknownTuple = !this.AddTupleFromExtension(tuple);
+                    case SymbolDefinitionType.MustBeFromAnExtension:
+                        unknownSymbol = !this.AddSymbolFromExtension(symbol);
                         break;
 
                     default:
-                        unknownTuple = !this.AddTupleDefaultly(tuple);
+                        unknownSymbol = !this.AddSymbolDefaultly(symbol);
                         break;
                 }
 
-                if (unknownTuple)
+                if (unknownSymbol)
                 {
-                    this.Messaging.Write(WarningMessages.TupleNotTranslatedToOutput(tuple));
+                    this.Messaging.Write(WarningMessages.SymbolNotTranslatedToOutput(symbol));
                 }
             }
 
-            this.AddIndexedCellTuples(cellsByTableAndRowId);
+            this.AddIndexedCellSymbols(cellsByTableAndRowId);
         }
 
-        private void AddAssemblyTuple(AssemblyTuple tuple)
+        private void AddAssemblySymbol(AssemblySymbol symbol)
         {
-            var attributes = tuple.Type == AssemblyType.Win32Assembly ? 1 : (int?)null;
+            var attributes = symbol.Type == AssemblyType.Win32Assembly ? 1 : (int?)null;
 
-            var row = this.CreateRow(tuple, "MsiAssembly");
-            row[0] = tuple.ComponentRef;
-            row[1] = tuple.FeatureRef;
-            row[2] = tuple.ManifestFileRef;
-            row[3] = tuple.ApplicationFileRef;
+            var row = this.CreateRow(symbol, "MsiAssembly");
+            row[0] = symbol.ComponentRef;
+            row[1] = symbol.FeatureRef;
+            row[2] = symbol.ManifestFileRef;
+            row[3] = symbol.ApplicationFileRef;
             row[4] = attributes;
         }
 
-        private void AddBBControlTuple(BBControlTuple tuple)
+        private void AddBBControlSymbol(BBControlSymbol symbol)
         {
-            var attributes = tuple.Attributes;
-            attributes |= tuple.Enabled ? WindowsInstallerConstants.MsidbControlAttributesEnabled : 0;
-            attributes |= tuple.Indirect ? WindowsInstallerConstants.MsidbControlAttributesIndirect : 0;
-            attributes |= tuple.Integer ? WindowsInstallerConstants.MsidbControlAttributesInteger : 0;
-            attributes |= tuple.LeftScroll ? WindowsInstallerConstants.MsidbControlAttributesLeftScroll : 0;
-            attributes |= tuple.RightAligned ? WindowsInstallerConstants.MsidbControlAttributesRightAligned : 0;
-            attributes |= tuple.RightToLeft ? WindowsInstallerConstants.MsidbControlAttributesRTLRO : 0;
-            attributes |= tuple.Sunken ? WindowsInstallerConstants.MsidbControlAttributesSunken : 0;
-            attributes |= tuple.Visible ? WindowsInstallerConstants.MsidbControlAttributesVisible : 0;
-
-            var row = this.CreateRow(tuple, "BBControl");
-            row[0] = tuple.BillboardRef;
-            row[1] = tuple.BBControl;
-            row[2] = tuple.Type;
-            row[3] = tuple.X;
-            row[4] = tuple.Y;
-            row[5] = tuple.Width;
-            row[6] = tuple.Height;
+            var attributes = symbol.Attributes;
+            attributes |= symbol.Enabled ? WindowsInstallerConstants.MsidbControlAttributesEnabled : 0;
+            attributes |= symbol.Indirect ? WindowsInstallerConstants.MsidbControlAttributesIndirect : 0;
+            attributes |= symbol.Integer ? WindowsInstallerConstants.MsidbControlAttributesInteger : 0;
+            attributes |= symbol.LeftScroll ? WindowsInstallerConstants.MsidbControlAttributesLeftScroll : 0;
+            attributes |= symbol.RightAligned ? WindowsInstallerConstants.MsidbControlAttributesRightAligned : 0;
+            attributes |= symbol.RightToLeft ? WindowsInstallerConstants.MsidbControlAttributesRTLRO : 0;
+            attributes |= symbol.Sunken ? WindowsInstallerConstants.MsidbControlAttributesSunken : 0;
+            attributes |= symbol.Visible ? WindowsInstallerConstants.MsidbControlAttributesVisible : 0;
+
+            var row = this.CreateRow(symbol, "BBControl");
+            row[0] = symbol.BillboardRef;
+            row[1] = symbol.BBControl;
+            row[2] = symbol.Type;
+            row[3] = symbol.X;
+            row[4] = symbol.Y;
+            row[5] = symbol.Width;
+            row[6] = symbol.Height;
             row[7] = attributes;
-            row[8] = tuple.Text;
+            row[8] = symbol.Text;
         }
 
-        private void AddClassTuple(ClassTuple tuple)
+        private void AddClassSymbol(ClassSymbol symbol)
         {
-            var row = this.CreateRow(tuple, "Class");
-            row[0] = tuple.CLSID;
-            row[1] = tuple.Context;
-            row[2] = tuple.ComponentRef;
-            row[3] = tuple.DefaultProgIdRef;
-            row[4] = tuple.Description;
-            row[5] = tuple.AppIdRef;
-            row[6] = tuple.FileTypeMask;
-            row[7] = tuple.IconRef;
-            row[8] = tuple.IconIndex;
-            row[9] = tuple.DefInprocHandler;
-            row[10] = tuple.Argument;
-            row[11] = tuple.FeatureRef;
-            row[12] = tuple.RelativePath ? (int?)1 : null;
+            var row = this.CreateRow(symbol, "Class");
+            row[0] = symbol.CLSID;
+            row[1] = symbol.Context;
+            row[2] = symbol.ComponentRef;
+            row[3] = symbol.DefaultProgIdRef;
+            row[4] = symbol.Description;
+            row[5] = symbol.AppIdRef;
+            row[6] = symbol.FileTypeMask;
+            row[7] = symbol.IconRef;
+            row[8] = symbol.IconIndex;
+            row[9] = symbol.DefInprocHandler;
+            row[10] = symbol.Argument;
+            row[11] = symbol.FeatureRef;
+            row[12] = symbol.RelativePath ? (int?)1 : null;
         }
 
-        private void AddControlTuple(ControlTuple tuple)
+        private void AddControlSymbol(ControlSymbol symbol)
         {
-            var text = tuple.Text;
-            var attributes = tuple.Attributes;
-            attributes |= tuple.Enabled ? WindowsInstallerConstants.MsidbControlAttributesEnabled : 0;
-            attributes |= tuple.Indirect ? WindowsInstallerConstants.MsidbControlAttributesIndirect : 0;
-            attributes |= tuple.Integer ? WindowsInstallerConstants.MsidbControlAttributesInteger : 0;
-            attributes |= tuple.LeftScroll ? WindowsInstallerConstants.MsidbControlAttributesLeftScroll : 0;
-            attributes |= tuple.RightAligned ? WindowsInstallerConstants.MsidbControlAttributesRightAligned : 0;
-            attributes |= tuple.RightToLeft ? WindowsInstallerConstants.MsidbControlAttributesRTLRO : 0;
-            attributes |= tuple.Sunken ? WindowsInstallerConstants.MsidbControlAttributesSunken : 0;
-            attributes |= tuple.Visible ? WindowsInstallerConstants.MsidbControlAttributesVisible : 0;
+            var text = symbol.Text;
+            var attributes = symbol.Attributes;
+            attributes |= symbol.Enabled ? WindowsInstallerConstants.MsidbControlAttributesEnabled : 0;
+            attributes |= symbol.Indirect ? WindowsInstallerConstants.MsidbControlAttributesIndirect : 0;
+            attributes |= symbol.Integer ? WindowsInstallerConstants.MsidbControlAttributesInteger : 0;
+            attributes |= symbol.LeftScroll ? WindowsInstallerConstants.MsidbControlAttributesLeftScroll : 0;
+            attributes |= symbol.RightAligned ? WindowsInstallerConstants.MsidbControlAttributesRightAligned : 0;
+            attributes |= symbol.RightToLeft ? WindowsInstallerConstants.MsidbControlAttributesRTLRO : 0;
+            attributes |= symbol.Sunken ? WindowsInstallerConstants.MsidbControlAttributesSunken : 0;
+            attributes |= symbol.Visible ? WindowsInstallerConstants.MsidbControlAttributesVisible : 0;
 
             // If we're tracking disk space, and this is a non-FormatSize Text control,
             // and the text attribute starts with '[' and ends with ']', add a space.
             // It is not necessary for the whole string to be a property, just those
             // two characters matter.
-            if (tuple.TrackDiskSpace &&
-                "Text" == tuple.Type &&
+            if (symbol.TrackDiskSpace &&
+                "Text" == symbol.Type &&
                 WindowsInstallerConstants.MsidbControlAttributesFormatSize != (attributes & WindowsInstallerConstants.MsidbControlAttributesFormatSize) &&
                 null != text && text.StartsWith("[", StringComparison.Ordinal) && text.EndsWith("]", StringComparison.Ordinal))
             {
                 text = String.Concat(text, " ");
             }
 
-            var row = this.CreateRow(tuple, "Control");
-            row[0] = tuple.DialogRef;
-            row[1] = tuple.Control;
-            row[2] = tuple.Type;
-            row[3] = tuple.X;
-            row[4] = tuple.Y;
-            row[5] = tuple.Width;
-            row[6] = tuple.Height;
+            var row = this.CreateRow(symbol, "Control");
+            row[0] = symbol.DialogRef;
+            row[1] = symbol.Control;
+            row[2] = symbol.Type;
+            row[3] = symbol.X;
+            row[4] = symbol.Y;
+            row[5] = symbol.Width;
+            row[6] = symbol.Height;
             row[7] = attributes;
             row[8] = text;
-            row[9] = tuple.NextControlRef;
-            row[10] = tuple.Help;
+            row[9] = symbol.NextControlRef;
+            row[10] = symbol.Help;
         }
 
-        private void AddComponentTuple(ComponentTuple tuple)
+        private void AddComponentSymbol(ComponentSymbol symbol)
         {
-            var attributes = ComponentLocation.Either == tuple.Location ? WindowsInstallerConstants.MsidbComponentAttributesOptional : 0;
-            attributes |= ComponentLocation.SourceOnly == tuple.Location ? WindowsInstallerConstants.MsidbComponentAttributesSourceOnly : 0;
-            attributes |= ComponentKeyPathType.Registry == tuple.KeyPathType ? WindowsInstallerConstants.MsidbComponentAttributesRegistryKeyPath : 0;
-            attributes |= ComponentKeyPathType.OdbcDataSource == tuple.KeyPathType ? WindowsInstallerConstants.MsidbComponentAttributesODBCDataSource : 0;
-            attributes |= tuple.DisableRegistryReflection ? WindowsInstallerConstants.MsidbComponentAttributesDisableRegistryReflection : 0;
-            attributes |= tuple.NeverOverwrite ? WindowsInstallerConstants.MsidbComponentAttributesNeverOverwrite : 0;
-            attributes |= tuple.Permanent ? WindowsInstallerConstants.MsidbComponentAttributesPermanent : 0;
-            attributes |= tuple.SharedDllRefCount ? WindowsInstallerConstants.MsidbComponentAttributesSharedDllRefCount : 0;
-            attributes |= tuple.Shared ? WindowsInstallerConstants.MsidbComponentAttributesShared : 0;
-            attributes |= tuple.Transitive ? WindowsInstallerConstants.MsidbComponentAttributesTransitive : 0;
-            attributes |= tuple.UninstallWhenSuperseded ? WindowsInstallerConstants.MsidbComponentAttributesUninstallOnSupersedence : 0;
-            attributes |= tuple.Win64 ? WindowsInstallerConstants.MsidbComponentAttributes64bit : 0;
-
-            var row = this.CreateRow(tuple, "Component");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.ComponentId;
-            row[2] = tuple.DirectoryRef;
+            var attributes = ComponentLocation.Either == symbol.Location ? WindowsInstallerConstants.MsidbComponentAttributesOptional : 0;
+            attributes |= ComponentLocation.SourceOnly == symbol.Location ? WindowsInstallerConstants.MsidbComponentAttributesSourceOnly : 0;
+            attributes |= ComponentKeyPathType.Registry == symbol.KeyPathType ? WindowsInstallerConstants.MsidbComponentAttributesRegistryKeyPath : 0;
+            attributes |= ComponentKeyPathType.OdbcDataSource == symbol.KeyPathType ? WindowsInstallerConstants.MsidbComponentAttributesODBCDataSource : 0;
+            attributes |= symbol.DisableRegistryReflection ? WindowsInstallerConstants.MsidbComponentAttributesDisableRegistryReflection : 0;
+            attributes |= symbol.NeverOverwrite ? WindowsInstallerConstants.MsidbComponentAttributesNeverOverwrite : 0;
+            attributes |= symbol.Permanent ? WindowsInstallerConstants.MsidbComponentAttributesPermanent : 0;
+            attributes |= symbol.SharedDllRefCount ? WindowsInstallerConstants.MsidbComponentAttributesSharedDllRefCount : 0;
+            attributes |= symbol.Shared ? WindowsInstallerConstants.MsidbComponentAttributesShared : 0;
+            attributes |= symbol.Transitive ? WindowsInstallerConstants.MsidbComponentAttributesTransitive : 0;
+            attributes |= symbol.UninstallWhenSuperseded ? WindowsInstallerConstants.MsidbComponentAttributesUninstallOnSupersedence : 0;
+            attributes |= symbol.Win64 ? WindowsInstallerConstants.MsidbComponentAttributes64bit : 0;
+
+            var row = this.CreateRow(symbol, "Component");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.ComponentId;
+            row[2] = symbol.DirectoryRef;
             row[3] = attributes;
-            row[4] = tuple.Condition;
-            row[5] = tuple.KeyPath;
+            row[4] = symbol.Condition;
+            row[5] = symbol.KeyPath;
         }
 
-        private void AddCustomActionTuple(CustomActionTuple tuple)
+        private void AddCustomActionSymbol(CustomActionSymbol symbol)
         {
-            var type = tuple.Win64 ? WindowsInstallerConstants.MsidbCustomActionType64BitScript : 0;
-            type |= tuple.IgnoreResult ? WindowsInstallerConstants.MsidbCustomActionTypeContinue : 0;
-            type |= tuple.Hidden ? WindowsInstallerConstants.MsidbCustomActionTypeHideTarget : 0;
-            type |= tuple.Async ? WindowsInstallerConstants.MsidbCustomActionTypeAsync : 0;
-            type |= CustomActionExecutionType.FirstSequence == tuple.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeFirstSequence : 0;
-            type |= CustomActionExecutionType.OncePerProcess == tuple.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeOncePerProcess : 0;
-            type |= CustomActionExecutionType.ClientRepeat == tuple.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeClientRepeat : 0;
-            type |= CustomActionExecutionType.Deferred == tuple.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeInScript : 0;
-            type |= CustomActionExecutionType.Rollback == tuple.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeInScript | WindowsInstallerConstants.MsidbCustomActionTypeRollback : 0;
-            type |= CustomActionExecutionType.Commit == tuple.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeInScript | WindowsInstallerConstants.MsidbCustomActionTypeCommit : 0;
-            type |= CustomActionSourceType.File == tuple.SourceType ? WindowsInstallerConstants.MsidbCustomActionTypeSourceFile : 0;
-            type |= CustomActionSourceType.Directory == tuple.SourceType ? WindowsInstallerConstants.MsidbCustomActionTypeDirectory : 0;
-            type |= CustomActionSourceType.Property == tuple.SourceType ? WindowsInstallerConstants.MsidbCustomActionTypeProperty : 0;
-            type |= CustomActionTargetType.Dll == tuple.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeDll : 0;
-            type |= CustomActionTargetType.Exe == tuple.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeExe : 0;
-            type |= CustomActionTargetType.TextData == tuple.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeTextData : 0;
-            type |= CustomActionTargetType.JScript == tuple.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeJScript : 0;
-            type |= CustomActionTargetType.VBScript == tuple.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeVBScript : 0;
+            var type = symbol.Win64 ? WindowsInstallerConstants.MsidbCustomActionType64BitScript : 0;
+            type |= symbol.IgnoreResult ? WindowsInstallerConstants.MsidbCustomActionTypeContinue : 0;
+            type |= symbol.Hidden ? WindowsInstallerConstants.MsidbCustomActionTypeHideTarget : 0;
+            type |= symbol.Async ? WindowsInstallerConstants.MsidbCustomActionTypeAsync : 0;
+            type |= CustomActionExecutionType.FirstSequence == symbol.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeFirstSequence : 0;
+            type |= CustomActionExecutionType.OncePerProcess == symbol.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeOncePerProcess : 0;
+            type |= CustomActionExecutionType.ClientRepeat == symbol.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeClientRepeat : 0;
+            type |= CustomActionExecutionType.Deferred == symbol.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeInScript : 0;
+            type |= CustomActionExecutionType.Rollback == symbol.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeInScript | WindowsInstallerConstants.MsidbCustomActionTypeRollback : 0;
+            type |= CustomActionExecutionType.Commit == symbol.ExecutionType ? WindowsInstallerConstants.MsidbCustomActionTypeInScript | WindowsInstallerConstants.MsidbCustomActionTypeCommit : 0;
+            type |= CustomActionSourceType.File == symbol.SourceType ? WindowsInstallerConstants.MsidbCustomActionTypeSourceFile : 0;
+            type |= CustomActionSourceType.Directory == symbol.SourceType ? WindowsInstallerConstants.MsidbCustomActionTypeDirectory : 0;
+            type |= CustomActionSourceType.Property == symbol.SourceType ? WindowsInstallerConstants.MsidbCustomActionTypeProperty : 0;
+            type |= CustomActionTargetType.Dll == symbol.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeDll : 0;
+            type |= CustomActionTargetType.Exe == symbol.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeExe : 0;
+            type |= CustomActionTargetType.TextData == symbol.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeTextData : 0;
+            type |= CustomActionTargetType.JScript == symbol.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeJScript : 0;
+            type |= CustomActionTargetType.VBScript == symbol.TargetType ? WindowsInstallerConstants.MsidbCustomActionTypeVBScript : 0;
 
             if (WindowsInstallerConstants.MsidbCustomActionTypeInScript == (type & WindowsInstallerConstants.MsidbCustomActionTypeInScript))
             {
-                type |= tuple.Impersonate ? 0 : WindowsInstallerConstants.MsidbCustomActionTypeNoImpersonate;
-                type |= tuple.TSAware ? WindowsInstallerConstants.MsidbCustomActionTypeTSAware : 0;
+                type |= symbol.Impersonate ? 0 : WindowsInstallerConstants.MsidbCustomActionTypeNoImpersonate;
+                type |= symbol.TSAware ? WindowsInstallerConstants.MsidbCustomActionTypeTSAware : 0;
             }
 
-            var row = this.CreateRow(tuple, "CustomAction");
-            row[0] = tuple.Id.Id;
+            var row = this.CreateRow(symbol, "CustomAction");
+            row[0] = symbol.Id.Id;
             row[1] = type;
-            row[2] = tuple.Source;
-            row[3] = tuple.Target;
-            row[4] = tuple.PatchUninstall ? (int?)WindowsInstallerConstants.MsidbCustomActionTypePatchUninstall : null;
+            row[2] = symbol.Source;
+            row[3] = symbol.Target;
+            row[4] = symbol.PatchUninstall ? (int?)WindowsInstallerConstants.MsidbCustomActionTypePatchUninstall : null;
         }
 
-        private void AddDialogTuple(DialogTuple tuple)
+        private void AddDialogSymbol(DialogSymbol symbol)
         {
-            var attributes = tuple.Visible ? WindowsInstallerConstants.MsidbDialogAttributesVisible : 0;
-            attributes |= tuple.Modal ? WindowsInstallerConstants.MsidbDialogAttributesModal : 0;
-            attributes |= tuple.Minimize ? WindowsInstallerConstants.MsidbDialogAttributesMinimize : 0;
-            attributes |= tuple.CustomPalette ? WindowsInstallerConstants.MsidbDialogAttributesUseCustomPalette : 0;
-            attributes |= tuple.ErrorDialog ? WindowsInstallerConstants.MsidbDialogAttributesError : 0;
-            attributes |= tuple.LeftScroll ? WindowsInstallerConstants.MsidbDialogAttributesLeftScroll : 0;
-            attributes |= tuple.KeepModeless ? WindowsInstallerConstants.MsidbDialogAttributesKeepModeless : 0;
-            attributes |= tuple.RightAligned ? WindowsInstallerConstants.MsidbDialogAttributesRightAligned : 0;
-            attributes |= tuple.RightToLeft ? WindowsInstallerConstants.MsidbDialogAttributesRTLRO : 0;
-            attributes |= tuple.SystemModal ? WindowsInstallerConstants.MsidbDialogAttributesSysModal : 0;
-            attributes |= tuple.TrackDiskSpace ? WindowsInstallerConstants.MsidbDialogAttributesTrackDiskSpace : 0;
-
-            var row = this.CreateRow(tuple, "Dialog");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.HCentering;
-            row[2] = tuple.VCentering;
-            row[3] = tuple.Width;
-            row[4] = tuple.Height;
+            var attributes = symbol.Visible ? WindowsInstallerConstants.MsidbDialogAttributesVisible : 0;
+            attributes |= symbol.Modal ? WindowsInstallerConstants.MsidbDialogAttributesModal : 0;
+            attributes |= symbol.Minimize ? WindowsInstallerConstants.MsidbDialogAttributesMinimize : 0;
+            attributes |= symbol.CustomPalette ? WindowsInstallerConstants.MsidbDialogAttributesUseCustomPalette : 0;
+            attributes |= symbol.ErrorDialog ? WindowsInstallerConstants.MsidbDialogAttributesError : 0;
+            attributes |= symbol.LeftScroll ? WindowsInstallerConstants.MsidbDialogAttributesLeftScroll : 0;
+            attributes |= symbol.KeepModeless ? WindowsInstallerConstants.MsidbDialogAttributesKeepModeless : 0;
+            attributes |= symbol.RightAligned ? WindowsInstallerConstants.MsidbDialogAttributesRightAligned : 0;
+            attributes |= symbol.RightToLeft ? WindowsInstallerConstants.MsidbDialogAttributesRTLRO : 0;
+            attributes |= symbol.SystemModal ? WindowsInstallerConstants.MsidbDialogAttributesSysModal : 0;
+            attributes |= symbol.TrackDiskSpace ? WindowsInstallerConstants.MsidbDialogAttributesTrackDiskSpace : 0;
+
+            var row = this.CreateRow(symbol, "Dialog");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.HCentering;
+            row[2] = symbol.VCentering;
+            row[3] = symbol.Width;
+            row[4] = symbol.Height;
             row[5] = attributes;
-            row[6] = tuple.Title;
-            row[7] = tuple.FirstControlRef;
-            row[8] = tuple.DefaultControlRef;
-            row[9] = tuple.CancelControlRef;
+            row[6] = symbol.Title;
+            row[7] = symbol.FirstControlRef;
+            row[8] = symbol.DefaultControlRef;
+            row[9] = symbol.CancelControlRef;
 
             this.Output.EnsureTable(this.TableDefinitions["ListBox"]);
         }
 
-        private void AddDirectoryTuple(DirectoryTuple tuple)
+        private void AddDirectorySymbol(DirectorySymbol symbol)
         {
-            var sourceName = GetMsiFilenameValue(tuple.SourceShortName, tuple.SourceName);
-            var targetName = GetMsiFilenameValue(tuple.ShortName, tuple.Name);
+            var sourceName = GetMsiFilenameValue(symbol.SourceShortName, symbol.SourceName);
+            var targetName = GetMsiFilenameValue(symbol.ShortName, symbol.Name);
 
             if (String.IsNullOrEmpty(targetName))
             {
@@ -439,20 +439,20 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             var defaultDir = String.IsNullOrEmpty(sourceName) ? targetName : targetName + ":" + sourceName;
 
-            var row = this.CreateRow(tuple, "Directory");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.ParentDirectoryRef;
+            var row = this.CreateRow(symbol, "Directory");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.ParentDirectoryRef;
             row[2] = defaultDir;
         }
 
-        private void AddEnvironmentTuple(EnvironmentTuple tuple)
+        private void AddEnvironmentSymbol(EnvironmentSymbol symbol)
         {
             var action = String.Empty;
-            var system = tuple.System ? "*" : String.Empty;
-            var uninstall = tuple.Permanent ? String.Empty : "-";
-            var value = tuple.Value;
+            var system = symbol.System ? "*" : String.Empty;
+            var uninstall = symbol.Permanent ? String.Empty : "-";
+            var value = symbol.Value;
 
-            switch (tuple.Action)
+            switch (symbol.Action)
             {
                 case EnvironmentActionType.Create:
                     action = "+";
@@ -465,219 +465,219 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     break;
             }
 
-            switch (tuple.Part)
+            switch (symbol.Part)
             {
                 case EnvironmentPartType.First:
-                    value = String.Concat(value, tuple.Separator, "[~]");
+                    value = String.Concat(value, symbol.Separator, "[~]");
                     break;
                 case EnvironmentPartType.Last:
-                    value = String.Concat("[~]", tuple.Separator, value);
+                    value = String.Concat("[~]", symbol.Separator, value);
                     break;
             }
 
-            var row = this.CreateRow(tuple, "Environment");
-            row[0] = tuple.Id.Id;
-            row[1] = String.Concat(action, uninstall, system, tuple.Name);
+            var row = this.CreateRow(symbol, "Environment");
+            row[0] = symbol.Id.Id;
+            row[1] = String.Concat(action, uninstall, system, symbol.Name);
             row[2] = value;
-            row[3] = tuple.ComponentRef;
+            row[3] = symbol.ComponentRef;
         }
 
-        private void AddErrorTuple(ErrorTuple tuple)
+        private void AddErrorSymbol(ErrorSymbol symbol)
         {
-            var row = this.CreateRow(tuple, "Error");
-            row[0] = Convert.ToInt32(tuple.Id.Id);
-            row[1] = tuple.Message;
+            var row = this.CreateRow(symbol, "Error");
+            row[0] = Convert.ToInt32(symbol.Id.Id);
+            row[1] = symbol.Message;
         }
 
-        private void AddFeatureTuple(FeatureTuple tuple)
+        private void AddFeatureSymbol(FeatureSymbol symbol)
         {
-            var attributes = tuple.DisallowAbsent ? WindowsInstallerConstants.MsidbFeatureAttributesUIDisallowAbsent : 0;
-            attributes |= tuple.DisallowAdvertise ? WindowsInstallerConstants.MsidbFeatureAttributesDisallowAdvertise : 0;
-            attributes |= FeatureInstallDefault.FollowParent == tuple.InstallDefault ? WindowsInstallerConstants.MsidbFeatureAttributesFollowParent : 0;
-            attributes |= FeatureInstallDefault.Source == tuple.InstallDefault ? WindowsInstallerConstants.MsidbFeatureAttributesFavorSource : 0;
-            attributes |= FeatureTypicalDefault.Advertise == tuple.TypicalDefault ? WindowsInstallerConstants.MsidbFeatureAttributesFavorAdvertise : 0;
-
-            var row = this.CreateRow(tuple, "Feature");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.ParentFeatureRef;
-            row[2] = tuple.Title;
-            row[3] = tuple.Description;
-            row[4] = tuple.Display;
-            row[5] = tuple.Level;
-            row[6] = tuple.DirectoryRef;
+            var attributes = symbol.DisallowAbsent ? WindowsInstallerConstants.MsidbFeatureAttributesUIDisallowAbsent : 0;
+            attributes |= symbol.DisallowAdvertise ? WindowsInstallerConstants.MsidbFeatureAttributesDisallowAdvertise : 0;
+            attributes |= FeatureInstallDefault.FollowParent == symbol.InstallDefault ? WindowsInstallerConstants.MsidbFeatureAttributesFollowParent : 0;
+            attributes |= FeatureInstallDefault.Source == symbol.InstallDefault ? WindowsInstallerConstants.MsidbFeatureAttributesFavorSource : 0;
+            attributes |= FeatureTypicalDefault.Advertise == symbol.TypicalDefault ? WindowsInstallerConstants.MsidbFeatureAttributesFavorAdvertise : 0;
+
+            var row = this.CreateRow(symbol, "Feature");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.ParentFeatureRef;
+            row[2] = symbol.Title;
+            row[3] = symbol.Description;
+            row[4] = symbol.Display;
+            row[5] = symbol.Level;
+            row[6] = symbol.DirectoryRef;
             row[7] = attributes;
         }
 
-        private void AddFileTuple(FileTuple tuple)
+        private void AddFileSymbol(FileSymbol symbol)
         {
-            var row = (FileRow)this.CreateRow(tuple, "File");
-            row.File = tuple.Id.Id;
-            row.Component = tuple.ComponentRef;
-            row.FileName = GetMsiFilenameValue(tuple.ShortName, tuple.Name);
-            row.FileSize = tuple.FileSize;
-            row.Version = tuple.Version;
-            row.Language = tuple.Language;
-            row.DiskId = tuple.DiskId ?? 1; // TODO: is 1 the correct thing to default here
-            row.Sequence = tuple.Sequence;
-            row.Source = tuple.Source.Path;
-
-            var attributes = (tuple.Attributes & FileTupleAttributes.Checksum) == FileTupleAttributes.Checksum ? WindowsInstallerConstants.MsidbFileAttributesChecksum : 0;
-            attributes |= (tuple.Attributes & FileTupleAttributes.Compressed) == FileTupleAttributes.Compressed ? WindowsInstallerConstants.MsidbFileAttributesCompressed : 0;
-            attributes |= (tuple.Attributes & FileTupleAttributes.Uncompressed) == FileTupleAttributes.Uncompressed ? WindowsInstallerConstants.MsidbFileAttributesNoncompressed : 0;
-            attributes |= (tuple.Attributes & FileTupleAttributes.Hidden) == FileTupleAttributes.Hidden ? WindowsInstallerConstants.MsidbFileAttributesHidden : 0;
-            attributes |= (tuple.Attributes & FileTupleAttributes.ReadOnly) == FileTupleAttributes.ReadOnly ? WindowsInstallerConstants.MsidbFileAttributesReadOnly : 0;
-            attributes |= (tuple.Attributes & FileTupleAttributes.System) == FileTupleAttributes.System ? WindowsInstallerConstants.MsidbFileAttributesSystem : 0;
-            attributes |= (tuple.Attributes & FileTupleAttributes.Vital) == FileTupleAttributes.Vital ? WindowsInstallerConstants.MsidbFileAttributesVital : 0;
+            var row = (FileRow)this.CreateRow(symbol, "File");
+            row.File = symbol.Id.Id;
+            row.Component = symbol.ComponentRef;
+            row.FileName = GetMsiFilenameValue(symbol.ShortName, symbol.Name);
+            row.FileSize = symbol.FileSize;
+            row.Version = symbol.Version;
+            row.Language = symbol.Language;
+            row.DiskId = symbol.DiskId ?? 1; // TODO: is 1 the correct thing to default here
+            row.Sequence = symbol.Sequence;
+            row.Source = symbol.Source.Path;
+
+            var attributes = (symbol.Attributes & FileSymbolAttributes.Checksum) == FileSymbolAttributes.Checksum ? WindowsInstallerConstants.MsidbFileAttributesChecksum : 0;
+            attributes |= (symbol.Attributes & FileSymbolAttributes.Compressed) == FileSymbolAttributes.Compressed ? WindowsInstallerConstants.MsidbFileAttributesCompressed : 0;
+            attributes |= (symbol.Attributes & FileSymbolAttributes.Uncompressed) == FileSymbolAttributes.Uncompressed ? WindowsInstallerConstants.MsidbFileAttributesNoncompressed : 0;
+            attributes |= (symbol.Attributes & FileSymbolAttributes.Hidden) == FileSymbolAttributes.Hidden ? WindowsInstallerConstants.MsidbFileAttributesHidden : 0;
+            attributes |= (symbol.Attributes & FileSymbolAttributes.ReadOnly) == FileSymbolAttributes.ReadOnly ? WindowsInstallerConstants.MsidbFileAttributesReadOnly : 0;
+            attributes |= (symbol.Attributes & FileSymbolAttributes.System) == FileSymbolAttributes.System ? WindowsInstallerConstants.MsidbFileAttributesSystem : 0;
+            attributes |= (symbol.Attributes & FileSymbolAttributes.Vital) == FileSymbolAttributes.Vital ? WindowsInstallerConstants.MsidbFileAttributesVital : 0;
             row.Attributes = attributes;
 
-            if (tuple.FontTitle != null)
+            if (symbol.FontTitle != null)
             {
-                var fontRow = this.CreateRow(tuple, "Font");
-                fontRow[0] = tuple.Id.Id;
-                fontRow[1] = tuple.FontTitle;
+                var fontRow = this.CreateRow(symbol, "Font");
+                fontRow[0] = symbol.Id.Id;
+                fontRow[1] = symbol.FontTitle;
             }
 
-            if (tuple.SelfRegCost.HasValue)
+            if (symbol.SelfRegCost.HasValue)
             {
-                var selfRegRow = this.CreateRow(tuple, "SelfReg");
-                selfRegRow[0] = tuple.Id.Id;
-                selfRegRow[1] = tuple.SelfRegCost.Value;
+                var selfRegRow = this.CreateRow(symbol, "SelfReg");
+                selfRegRow[0] = symbol.Id.Id;
+                selfRegRow[1] = symbol.SelfRegCost.Value;
             }
         }
 
-        private void AddIniFileTuple(IniFileTuple tuple)
+        private void AddIniFileSymbol(IniFileSymbol symbol)
         {
-            var tableName = (InifFileActionType.AddLine == tuple.Action || InifFileActionType.AddTag == tuple.Action || InifFileActionType.CreateLine == tuple.Action) ? "IniFile" : "RemoveIniFile";
-
-            var row = this.CreateRow(tuple, tableName);
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.FileName;
-            row[2] = tuple.DirProperty;
-            row[3] = tuple.Section;
-            row[4] = tuple.Key;
-            row[5] = tuple.Value;
-            row[6] = tuple.Action;
-            row[7] = tuple.ComponentRef;
+            var tableName = (InifFileActionType.AddLine == symbol.Action || InifFileActionType.AddTag == symbol.Action || InifFileActionType.CreateLine == symbol.Action) ? "IniFile" : "RemoveIniFile";
+
+            var row = this.CreateRow(symbol, tableName);
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.FileName;
+            row[2] = symbol.DirProperty;
+            row[3] = symbol.Section;
+            row[4] = symbol.Key;
+            row[5] = symbol.Value;
+            row[6] = symbol.Action;
+            row[7] = symbol.ComponentRef;
         }
 
-        private void AddMediaTuple(MediaTuple tuple)
+        private void AddMediaSymbol(MediaSymbol symbol)
         {
             if (this.Section.Type != SectionType.Module)
             {
-                var row = (MediaRow)this.CreateRow(tuple, "Media");
-                row.DiskId = tuple.DiskId;
-                row.LastSequence = tuple.LastSequence ?? 0;
-                row.DiskPrompt = tuple.DiskPrompt;
-                row.Cabinet = tuple.Cabinet;
-                row.VolumeLabel = tuple.VolumeLabel;
-                row.Source = tuple.Source;
+                var row = (MediaRow)this.CreateRow(symbol, "Media");
+                row.DiskId = symbol.DiskId;
+                row.LastSequence = symbol.LastSequence ?? 0;
+                row.DiskPrompt = symbol.DiskPrompt;
+                row.Cabinet = symbol.Cabinet;
+                row.VolumeLabel = symbol.VolumeLabel;
+                row.Source = symbol.Source;
             }
         }
 
-        private void AddModuleConfigurationTuple(ModuleConfigurationTuple tuple)
+        private void AddModuleConfigurationSymbol(ModuleConfigurationSymbol symbol)
         {
-            var row = this.CreateRow(tuple, "ModuleConfiguration");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.Format;
-            row[2] = tuple.Type;
-            row[3] = tuple.ContextData;
-            row[4] = tuple.DefaultValue;
-            row[5] = (tuple.KeyNoOrphan ? WindowsInstallerConstants.MsidbMsmConfigurableOptionKeyNoOrphan : 0) |
-                     (tuple.NonNullable ? WindowsInstallerConstants.MsidbMsmConfigurableOptionNonNullable : 0);
-            row[6] = tuple.DisplayName;
-            row[7] = tuple.Description;
-            row[8] = tuple.HelpLocation;
-            row[9] = tuple.HelpKeyword;
+            var row = this.CreateRow(symbol, "ModuleConfiguration");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.Format;
+            row[2] = symbol.Type;
+            row[3] = symbol.ContextData;
+            row[4] = symbol.DefaultValue;
+            row[5] = (symbol.KeyNoOrphan ? WindowsInstallerConstants.MsidbMsmConfigurableOptionKeyNoOrphan : 0) |
+                     (symbol.NonNullable ? WindowsInstallerConstants.MsidbMsmConfigurableOptionNonNullable : 0);
+            row[6] = symbol.DisplayName;
+            row[7] = symbol.Description;
+            row[8] = symbol.HelpLocation;
+            row[9] = symbol.HelpKeyword;
         }
 
-        private void AddMsiEmbeddedUITuple(MsiEmbeddedUITuple tuple)
+        private void AddMsiEmbeddedUISymbol(MsiEmbeddedUISymbol symbol)
         {
-            var attributes = tuple.EntryPoint ? WindowsInstallerConstants.MsidbEmbeddedUI : 0;
-            attributes |= tuple.SupportsBasicUI ? WindowsInstallerConstants.MsidbEmbeddedHandlesBasic : 0;
+            var attributes = symbol.EntryPoint ? WindowsInstallerConstants.MsidbEmbeddedUI : 0;
+            attributes |= symbol.SupportsBasicUI ? WindowsInstallerConstants.MsidbEmbeddedHandlesBasic : 0;
 
-            var row = this.CreateRow(tuple, "MsiEmbeddedUI");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.FileName;
+            var row = this.CreateRow(symbol, "MsiEmbeddedUI");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.FileName;
             row[2] = attributes;
-            row[3] = tuple.MessageFilter;
-            row[4] = tuple.Source;
+            row[3] = symbol.MessageFilter;
+            row[4] = symbol.Source;
         }
 
-        private void AddMsiServiceConfigTuple(MsiServiceConfigTuple tuple)
+        private void AddMsiServiceConfigSymbol(MsiServiceConfigSymbol symbol)
         {
-            var events = tuple.OnInstall ? WindowsInstallerConstants.MsidbServiceConfigEventInstall : 0;
-            events |= tuple.OnReinstall ? WindowsInstallerConstants.MsidbServiceConfigEventReinstall : 0;
-            events |= tuple.OnUninstall ? WindowsInstallerConstants.MsidbServiceConfigEventUninstall : 0;
+            var events = symbol.OnInstall ? WindowsInstallerConstants.MsidbServiceConfigEventInstall : 0;
+            events |= symbol.OnReinstall ? WindowsInstallerConstants.MsidbServiceConfigEventReinstall : 0;
+            events |= symbol.OnUninstall ? WindowsInstallerConstants.MsidbServiceConfigEventUninstall : 0;
 
-            var row = this.CreateRow(tuple, "MsiServiceConfigFailureActions");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.Name;
+            var row = this.CreateRow(symbol, "MsiServiceConfigFailureActions");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.Name;
             row[2] = events;
-            row[3] = tuple.ConfigType;
-            row[4] = tuple.Argument;
-            row[5] = tuple.ComponentRef;
+            row[3] = symbol.ConfigType;
+            row[4] = symbol.Argument;
+            row[5] = symbol.ComponentRef;
         }
 
-        private void AddMsiServiceConfigFailureActionsTuple(MsiServiceConfigFailureActionsTuple tuple)
+        private void AddMsiServiceConfigFailureActionsSymbol(MsiServiceConfigFailureActionsSymbol symbol)
         {
-            var events = tuple.OnInstall ? WindowsInstallerConstants.MsidbServiceConfigEventInstall : 0;
-            events |= tuple.OnReinstall ? WindowsInstallerConstants.MsidbServiceConfigEventReinstall : 0;
-            events |= tuple.OnUninstall ? WindowsInstallerConstants.MsidbServiceConfigEventUninstall : 0;
+            var events = symbol.OnInstall ? WindowsInstallerConstants.MsidbServiceConfigEventInstall : 0;
+            events |= symbol.OnReinstall ? WindowsInstallerConstants.MsidbServiceConfigEventReinstall : 0;
+            events |= symbol.OnUninstall ? WindowsInstallerConstants.MsidbServiceConfigEventUninstall : 0;
 
-            var row = this.CreateRow(tuple, "MsiServiceConfig");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.Name;
+            var row = this.CreateRow(symbol, "MsiServiceConfig");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.Name;
             row[2] = events;
-            row[3] = tuple.ResetPeriod.HasValue ? tuple.ResetPeriod : null;
-            row[4] = tuple.RebootMessage ?? "[~]";
-            row[5] = tuple.Command ?? "[~]";
-            row[6] = tuple.Actions;
-            row[7] = tuple.DelayActions;
-            row[8] = tuple.ComponentRef;
+            row[3] = symbol.ResetPeriod.HasValue ? symbol.ResetPeriod : null;
+            row[4] = symbol.RebootMessage ?? "[~]";
+            row[5] = symbol.Command ?? "[~]";
+            row[6] = symbol.Actions;
+            row[7] = symbol.DelayActions;
+            row[8] = symbol.ComponentRef;
         }
 
-        private void AddMoveFileTuple(MoveFileTuple tuple)
+        private void AddMoveFileSymbol(MoveFileSymbol symbol)
         {
-            var row = this.CreateRow(tuple, "MoveFile");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.ComponentRef;
-            row[2] = tuple.SourceName;
-            row[3] = tuple.DestName;
-            row[4] = tuple.SourceFolder;
-            row[5] = tuple.DestFolder;
-            row[6] = tuple.Delete ? WindowsInstallerConstants.MsidbMoveFileOptionsMove : 0;
+            var row = this.CreateRow(symbol, "MoveFile");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.ComponentRef;
+            row[2] = symbol.SourceName;
+            row[3] = symbol.DestName;
+            row[4] = symbol.SourceFolder;
+            row[5] = symbol.DestFolder;
+            row[6] = symbol.Delete ? WindowsInstallerConstants.MsidbMoveFileOptionsMove : 0;
         }
 
-        private void AddPropertyTuple(PropertyTuple tuple)
+        private void AddPropertySymbol(PropertySymbol symbol)
         {
-            if (String.IsNullOrEmpty(tuple.Value))
+            if (String.IsNullOrEmpty(symbol.Value))
             {
                 return;
             }
 
-            var row = (PropertyRow)this.CreateRow(tuple, "Property");
-            row.Property = tuple.Id.Id;
-            row.Value = tuple.Value;
+            var row = (PropertyRow)this.CreateRow(symbol, "Property");
+            row.Property = symbol.Id.Id;
+            row.Value = symbol.Value;
         }
 
-        private void AddRemoveFileTuple(RemoveFileTuple tuple)
+        private void AddRemoveFileSymbol(RemoveFileSymbol symbol)
         {
-            var installMode = tuple.OnInstall == true ? WindowsInstallerConstants.MsidbRemoveFileInstallModeOnInstall : 0;
-            installMode |= tuple.OnUninstall == true ? WindowsInstallerConstants.MsidbRemoveFileInstallModeOnRemove : 0;
-
-            var row = this.CreateRow(tuple, "RemoveFile");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.ComponentRef;
-            row[2] = tuple.FileName;
-            row[3] = tuple.DirProperty;
+            var installMode = symbol.OnInstall == true ? WindowsInstallerConstants.MsidbRemoveFileInstallModeOnInstall : 0;
+            installMode |= symbol.OnUninstall == true ? WindowsInstallerConstants.MsidbRemoveFileInstallModeOnRemove : 0;
+
+            var row = this.CreateRow(symbol, "RemoveFile");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.ComponentRef;
+            row[2] = symbol.FileName;
+            row[3] = symbol.DirProperty;
             row[4] = installMode;
         }
 
-        private void AddRegistryTuple(RegistryTuple tuple)
+        private void AddRegistrySymbol(RegistrySymbol symbol)
         {
-            var value = tuple.Value;
+            var value = symbol.Value;
 
-            switch (tuple.ValueType)
+            switch (symbol.ValueType)
             {
                 case RegistryValueType.Binary:
                     value = String.Concat("#x", value);
@@ -689,7 +689,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     value = String.Concat("#", value);
                     break;
                 case RegistryValueType.MultiString:
-                    switch (tuple.ValueAction)
+                    switch (symbol.ValueAction)
                     {
                         case RegistryValueActionType.Append:
                             value = String.Concat("[~]", value);
@@ -715,164 +715,164 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     break;
             }
 
-            var row = this.CreateRow(tuple, "Registry");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.Root;
-            row[2] = tuple.Key;
-            row[3] = tuple.Name;
+            var row = this.CreateRow(symbol, "Registry");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.Root;
+            row[2] = symbol.Key;
+            row[3] = symbol.Name;
             row[4] = value;
-            row[5] = tuple.ComponentRef;
+            row[5] = symbol.ComponentRef;
         }
 
-        private void AddRegLocatorTuple(RegLocatorTuple tuple)
+        private void AddRegLocatorSymbol(RegLocatorSymbol symbol)
         {
-            var type = (int)tuple.Type;
-            type |= tuple.Win64 ? WindowsInstallerConstants.MsidbLocatorType64bit : 0;
-
-            var row = this.CreateRow(tuple, "RegLocator");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.Root;
-            row[2] = tuple.Key;
-            row[3] = tuple.Name;
+            var type = (int)symbol.Type;
+            type |= symbol.Win64 ? WindowsInstallerConstants.MsidbLocatorType64bit : 0;
+
+            var row = this.CreateRow(symbol, "RegLocator");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.Root;
+            row[2] = symbol.Key;
+            row[3] = symbol.Name;
             row[4] = type;
         }
 
-        private void AddRemoveRegistryTuple(RemoveRegistryTuple tuple)
+        private void AddRemoveRegistrySymbol(RemoveRegistrySymbol symbol)
         {
-            if (tuple.Action == RemoveRegistryActionType.RemoveOnInstall)
+            if (symbol.Action == RemoveRegistryActionType.RemoveOnInstall)
             {
-                var row = this.CreateRow(tuple, "RemoveRegistry");
-                row[0] = tuple.Id.Id;
-                row[1] = tuple.Root;
-                row[2] = tuple.Key;
-                row[3] = tuple.Name;
-                row[4] = tuple.ComponentRef;
+                var row = this.CreateRow(symbol, "RemoveRegistry");
+                row[0] = symbol.Id.Id;
+                row[1] = symbol.Root;
+                row[2] = symbol.Key;
+                row[3] = symbol.Name;
+                row[4] = symbol.ComponentRef;
             }
             else // Registry table is used to remove registry keys on uninstall.
             {
-                var row = this.CreateRow(tuple, "Registry");
-                row[0] = tuple.Id.Id;
-                row[1] = tuple.Root;
-                row[2] = tuple.Key;
-                row[3] = tuple.Name;
-                row[5] = tuple.ComponentRef;
+                var row = this.CreateRow(symbol, "Registry");
+                row[0] = symbol.Id.Id;
+                row[1] = symbol.Root;
+                row[2] = symbol.Key;
+                row[3] = symbol.Name;
+                row[5] = symbol.ComponentRef;
             }
         }
 
-        private void AddServiceControlTuple(ServiceControlTuple tuple)
+        private void AddServiceControlSymbol(ServiceControlSymbol symbol)
         {
-            var events = tuple.InstallRemove ? WindowsInstallerConstants.MsidbServiceControlEventDelete : 0;
-            events |= tuple.UninstallRemove ? WindowsInstallerConstants.MsidbServiceControlEventUninstallDelete : 0;
-            events |= tuple.InstallStart ? WindowsInstallerConstants.MsidbServiceControlEventStart : 0;
-            events |= tuple.UninstallStart ? WindowsInstallerConstants.MsidbServiceControlEventUninstallStart : 0;
-            events |= tuple.InstallStop ? WindowsInstallerConstants.MsidbServiceControlEventStop : 0;
-            events |= tuple.UninstallStop ? WindowsInstallerConstants.MsidbServiceControlEventUninstallStop : 0;
-
-            var row = this.CreateRow(tuple, "ServiceControl");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.Name;
+            var events = symbol.InstallRemove ? WindowsInstallerConstants.MsidbServiceControlEventDelete : 0;
+            events |= symbol.UninstallRemove ? WindowsInstallerConstants.MsidbServiceControlEventUninstallDelete : 0;
+            events |= symbol.InstallStart ? WindowsInstallerConstants.MsidbServiceControlEventStart : 0;
+            events |= symbol.UninstallStart ? WindowsInstallerConstants.MsidbServiceControlEventUninstallStart : 0;
+            events |= symbol.InstallStop ? WindowsInstallerConstants.MsidbServiceControlEventStop : 0;
+            events |= symbol.UninstallStop ? WindowsInstallerConstants.MsidbServiceControlEventUninstallStop : 0;
+
+            var row = this.CreateRow(symbol, "ServiceControl");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.Name;
             row[2] = events;
-            row[3] = tuple.Arguments;
-            if (tuple.Wait.HasValue)
+            row[3] = symbol.Arguments;
+            if (symbol.Wait.HasValue)
             {
-                row[4] = tuple.Wait.Value ? 1 : 0;
+                row[4] = symbol.Wait.Value ? 1 : 0;
             }
-            row[5] = tuple.ComponentRef;
+            row[5] = symbol.ComponentRef;
         }
 
-        private void AddServiceInstallTuple(ServiceInstallTuple tuple)
+        private void AddServiceInstallSymbol(ServiceInstallSymbol symbol)
         {
-            var errorControl = (int)tuple.ErrorControl;
-            errorControl |= tuple.Vital ? WindowsInstallerConstants.MsidbServiceInstallErrorControlVital : 0;
+            var errorControl = (int)symbol.ErrorControl;
+            errorControl |= symbol.Vital ? WindowsInstallerConstants.MsidbServiceInstallErrorControlVital : 0;
 
-            var serviceType = (int)tuple.ServiceType;
-            serviceType |= tuple.Interactive ? WindowsInstallerConstants.MsidbServiceInstallInteractive : 0;
+            var serviceType = (int)symbol.ServiceType;
+            serviceType |= symbol.Interactive ? WindowsInstallerConstants.MsidbServiceInstallInteractive : 0;
 
-            var row = this.CreateRow(tuple, "ServiceInstall");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.Name;
-            row[2] = tuple.DisplayName;
+            var row = this.CreateRow(symbol, "ServiceInstall");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.Name;
+            row[2] = symbol.DisplayName;
             row[3] = serviceType;
-            row[4] = (int)tuple.StartType;
+            row[4] = (int)symbol.StartType;
             row[5] = errorControl;
-            row[6] = tuple.LoadOrderGroup;
-            row[7] = tuple.Dependencies;
-            row[8] = tuple.StartName;
-            row[9] = tuple.Password;
-            row[10] = tuple.Arguments;
-            row[11] = tuple.ComponentRef;
-            row[12] = tuple.Description;
+            row[6] = symbol.LoadOrderGroup;
+            row[7] = symbol.Dependencies;
+            row[8] = symbol.StartName;
+            row[9] = symbol.Password;
+            row[10] = symbol.Arguments;
+            row[11] = symbol.ComponentRef;
+            row[12] = symbol.Description;
         }
 
-        private void AddShortcutTuple(ShortcutTuple tuple)
+        private void AddShortcutSymbol(ShortcutSymbol symbol)
         {
-            var row = this.CreateRow(tuple, "Shortcut");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.DirectoryRef;
-            row[2] = GetMsiFilenameValue(tuple.ShortName, tuple.Name);
-            row[3] = tuple.ComponentRef;
-            row[4] = tuple.Target;
-            row[5] = tuple.Arguments;
-            row[6] = tuple.Description;
-            row[7] = tuple.Hotkey;
-            row[8] = tuple.IconRef;
-            row[9] = tuple.IconIndex;
-            row[10] = (int?)tuple.Show;
-            row[11] = tuple.WorkingDirectory;
-            row[12] = tuple.DisplayResourceDll;
-            row[13] = tuple.DisplayResourceId;
-            row[14] = tuple.DescriptionResourceDll;
-            row[15] = tuple.DescriptionResourceId;
+            var row = this.CreateRow(symbol, "Shortcut");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.DirectoryRef;
+            row[2] = GetMsiFilenameValue(symbol.ShortName, symbol.Name);
+            row[3] = symbol.ComponentRef;
+            row[4] = symbol.Target;
+            row[5] = symbol.Arguments;
+            row[6] = symbol.Description;
+            row[7] = symbol.Hotkey;
+            row[8] = symbol.IconRef;
+            row[9] = symbol.IconIndex;
+            row[10] = (int?)symbol.Show;
+            row[11] = symbol.WorkingDirectory;
+            row[12] = symbol.DisplayResourceDll;
+            row[13] = symbol.DisplayResourceId;
+            row[14] = symbol.DescriptionResourceDll;
+            row[15] = symbol.DescriptionResourceId;
         }
 
-        private void AddTextStyleTuple(TextStyleTuple tuple)
+        private void AddTextStyleSymbol(TextStyleSymbol symbol)
         {
-            var styleBits = tuple.Bold ? WindowsInstallerConstants.MsidbTextStyleStyleBitsBold : 0;
-            styleBits |= tuple.Italic ? WindowsInstallerConstants.MsidbTextStyleStyleBitsItalic : 0;
-            styleBits |= tuple.Strike ? WindowsInstallerConstants.MsidbTextStyleStyleBitsStrike : 0;
-            styleBits |= tuple.Underline ? WindowsInstallerConstants.MsidbTextStyleStyleBitsUnderline : 0;
+            var styleBits = symbol.Bold ? WindowsInstallerConstants.MsidbTextStyleStyleBitsBold : 0;
+            styleBits |= symbol.Italic ? WindowsInstallerConstants.MsidbTextStyleStyleBitsItalic : 0;
+            styleBits |= symbol.Strike ? WindowsInstallerConstants.MsidbTextStyleStyleBitsStrike : 0;
+            styleBits |= symbol.Underline ? WindowsInstallerConstants.MsidbTextStyleStyleBitsUnderline : 0;
 
             long? color = null;
 
-            if (tuple.Red.HasValue || tuple.Green.HasValue || tuple.Blue.HasValue)
+            if (symbol.Red.HasValue || symbol.Green.HasValue || symbol.Blue.HasValue)
             {
-                color = tuple.Red ?? 0;
-                color += (long)(tuple.Green ?? 0) * 256;
-                color += (long)(tuple.Blue ?? 0) * 65536;
+                color = symbol.Red ?? 0;
+                color += (long)(symbol.Green ?? 0) * 256;
+                color += (long)(symbol.Blue ?? 0) * 65536;
             }
 
-            var row = this.CreateRow(tuple, "TextStyle");
-            row[0] = tuple.Id.Id;
-            row[1] = tuple.FaceName;
-            row[2] = tuple.Size;
+            var row = this.CreateRow(symbol, "TextStyle");
+            row[0] = symbol.Id.Id;
+            row[1] = symbol.FaceName;
+            row[2] = symbol.Size;
             row[3] = color;
             row[4] = styleBits == 0 ? null : (int?)styleBits;
         }
 
-        private void AddUpgradeTuple(UpgradeTuple tuple)
+        private void AddUpgradeSymbol(UpgradeSymbol symbol)
         {
-            var row = (UpgradeRow)this.CreateRow(tuple, "Upgrade");
-            row.UpgradeCode = tuple.UpgradeCode;
-            row.VersionMin = tuple.VersionMin;
-            row.VersionMax = tuple.VersionMax;
-            row.Language = tuple.Language;
-            row.Remove = tuple.Remove;
-            row.ActionProperty = tuple.ActionProperty;
-
-            var attributes = tuple.MigrateFeatures ? WindowsInstallerConstants.MsidbUpgradeAttributesMigrateFeatures : 0;
-            attributes |= tuple.OnlyDetect ? WindowsInstallerConstants.MsidbUpgradeAttributesOnlyDetect : 0;
-            attributes |= tuple.IgnoreRemoveFailures ? WindowsInstallerConstants.MsidbUpgradeAttributesIgnoreRemoveFailure : 0;
-            attributes |= tuple.VersionMinInclusive ? WindowsInstallerConstants.MsidbUpgradeAttributesVersionMinInclusive : 0;
-            attributes |= tuple.VersionMaxInclusive ? WindowsInstallerConstants.MsidbUpgradeAttributesVersionMaxInclusive : 0;
-            attributes |= tuple.ExcludeLanguages ? WindowsInstallerConstants.MsidbUpgradeAttributesLanguagesExclusive : 0;
+            var row = (UpgradeRow)this.CreateRow(symbol, "Upgrade");
+            row.UpgradeCode = symbol.UpgradeCode;
+            row.VersionMin = symbol.VersionMin;
+            row.VersionMax = symbol.VersionMax;
+            row.Language = symbol.Language;
+            row.Remove = symbol.Remove;
+            row.ActionProperty = symbol.ActionProperty;
+
+            var attributes = symbol.MigrateFeatures ? WindowsInstallerConstants.MsidbUpgradeAttributesMigrateFeatures : 0;
+            attributes |= symbol.OnlyDetect ? WindowsInstallerConstants.MsidbUpgradeAttributesOnlyDetect : 0;
+            attributes |= symbol.IgnoreRemoveFailures ? WindowsInstallerConstants.MsidbUpgradeAttributesIgnoreRemoveFailure : 0;
+            attributes |= symbol.VersionMinInclusive ? WindowsInstallerConstants.MsidbUpgradeAttributesVersionMinInclusive : 0;
+            attributes |= symbol.VersionMaxInclusive ? WindowsInstallerConstants.MsidbUpgradeAttributesVersionMaxInclusive : 0;
+            attributes |= symbol.ExcludeLanguages ? WindowsInstallerConstants.MsidbUpgradeAttributesLanguagesExclusive : 0;
             row.Attributes = attributes;
         }
 
-        private void AddWixActionTuple(WixActionTuple tuple)
+        private void AddWixActionSymbol(WixActionSymbol symbol)
         {
             // Get the table definition for the action (and ensure the proper table exists for a module).
             string sequenceTableName = null;
-            switch (tuple.SequenceTable)
+            switch (symbol.SequenceTable)
             {
                 case SequenceTable.AdminExecuteSequence:
                     if (OutputType.Module == this.Output.Type)
@@ -932,60 +932,60 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
 
             // create the action sequence row in the output
-            var row = this.CreateRow(tuple, sequenceTableName);
+            var row = this.CreateRow(symbol, sequenceTableName);
 
             if (SectionType.Module == this.Section.Type)
             {
-                row[0] = tuple.Action;
-                if (0 != tuple.Sequence)
+                row[0] = symbol.Action;
+                if (0 != symbol.Sequence)
                 {
-                    row[1] = tuple.Sequence;
+                    row[1] = symbol.Sequence;
                 }
                 else
                 {
-                    var after = (null == tuple.Before);
-                    row[2] = after ? tuple.After : tuple.Before;
+                    var after = (null == symbol.Before);
+                    row[2] = after ? symbol.After : symbol.Before;
                     row[3] = after ? 1 : 0;
                 }
-                row[4] = tuple.Condition;
+                row[4] = symbol.Condition;
             }
             else
             {
-                row[0] = tuple.Action;
-                row[1] = tuple.Condition;
-                row[2] = tuple.Sequence;
+                row[0] = symbol.Action;
+                row[1] = symbol.Condition;
+                row[2] = symbol.Sequence;
             }
         }
 
-        private void IndexCustomTableCellTuple(WixCustomTableCellTuple wixCustomTableCellTuple, Dictionary<string, List<WixCustomTableCellTuple>> cellsByTableAndRowId)
+        private void IndexCustomTableCellSymbol(WixCustomTableCellSymbol wixCustomTableCellSymbol, Dictionary<string, List<WixCustomTableCellSymbol>> cellsByTableAndRowId)
         {
-            var tableAndRowId = wixCustomTableCellTuple.TableRef + "/" + wixCustomTableCellTuple.RowId;
+            var tableAndRowId = wixCustomTableCellSymbol.TableRef + "/" + wixCustomTableCellSymbol.RowId;
             if (!cellsByTableAndRowId.TryGetValue(tableAndRowId, out var cells))
             {
-                cells = new List<WixCustomTableCellTuple>();
+                cells = new List<WixCustomTableCellSymbol>();
                 cellsByTableAndRowId.Add(tableAndRowId, cells);
             }
 
-            cells.Add(wixCustomTableCellTuple);
+            cells.Add(wixCustomTableCellSymbol);
         }
 
-        private void AddIndexedCellTuples(Dictionary<string, List<WixCustomTableCellTuple>> cellsByTableAndRowId)
+        private void AddIndexedCellSymbols(Dictionary<string, List<WixCustomTableCellSymbol>> cellsByTableAndRowId)
         {
             foreach (var rowOfCells in cellsByTableAndRowId.Values)
             {
-                var firstCellTuple = rowOfCells[0];
-                var customTableDefinition = this.TableDefinitions[firstCellTuple.TableRef];
+                var firstCellSymbol = rowOfCells[0];
+                var customTableDefinition = this.TableDefinitions[firstCellSymbol.TableRef];
 
                 if (customTableDefinition.Unreal)
                 {
                     continue;
                 }
 
-                var customRow = this.CreateRow(firstCellTuple, customTableDefinition);
+                var customRow = this.CreateRow(firstCellSymbol, customTableDefinition);
                 var customRowFieldsByColumnName = customRow.Fields.ToDictionary(f => f.Column.Name);
 
 #if TODO // SectionId seems like a good thing to preserve.
-                customRow.SectionId = tuple.SectionId;
+                customRow.SectionId = symbol.SectionId;
 #endif
                 foreach (var cell in rowOfCells)
                 {
@@ -1037,23 +1037,23 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 {
                     if (!customTableDefinition.Columns[i].Nullable && (null == customRow.Fields[i].Data || 0 == customRow.Fields[i].Data.ToString().Length))
                     {
-                        this.Messaging.Write(ErrorMessages.NoDataForColumn(firstCellTuple.SourceLineNumbers, customTableDefinition.Columns[i].Name, customTableDefinition.Name));
+                        this.Messaging.Write(ErrorMessages.NoDataForColumn(firstCellSymbol.SourceLineNumbers, customTableDefinition.Columns[i].Name, customTableDefinition.Name));
                     }
                 }
             }
         }
 
-        private void AddWixEnsureTableTuple(WixEnsureTableTuple tuple)
+        private void AddWixEnsureTableSymbol(WixEnsureTableSymbol symbol)
         {
-            var tableDefinition = this.TableDefinitions[tuple.Table];
+            var tableDefinition = this.TableDefinitions[symbol.Table];
             this.Output.EnsureTable(tableDefinition);
         }
 
-        private bool AddTupleFromExtension(IntermediateTuple tuple)
+        private bool AddSymbolFromExtension(IntermediateSymbol symbol)
         {
             foreach (var extension in this.BackendExtensions)
             {
-                if (extension.TryAddTupleToOutput(this.Section, tuple, this.Output, this.TableDefinitions))
+                if (extension.TryAddSymbolToOutput(this.Section, symbol, this.Output, this.TableDefinitions))
                 {
                     return true;
                 }
@@ -1062,8 +1062,8 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return false;
         }
 
-        private bool AddTupleDefaultly(IntermediateTuple tuple) =>
-            this.BackendHelper.TryAddTupleToOutputMatchingTableDefinitions(this.Section, tuple, this.Output, this.TableDefinitions);
+        private bool AddSymbolDefaultly(IntermediateSymbol symbol) =>
+            this.BackendHelper.TryAddSymbolToOutputMatchingTableDefinitions(this.Section, symbol, this.Output, this.TableDefinitions);
 
         private static OutputType SectionTypeToOutputType(SectionType type)
         {
@@ -1085,11 +1085,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
         }
 
-        private Row CreateRow(IntermediateTuple tuple, string tableDefinitionName) =>
-            this.CreateRow(tuple, this.TableDefinitions[tableDefinitionName]);
+        private Row CreateRow(IntermediateSymbol symbol, string tableDefinitionName) =>
+            this.CreateRow(symbol, this.TableDefinitions[tableDefinitionName]);
 
-        private Row CreateRow(IntermediateTuple tuple, TableDefinition tableDefinition) =>
-            this.BackendHelper.CreateRow(this.Section, tuple, this.Output, tableDefinition);
+        private Row CreateRow(IntermediateSymbol symbol, TableDefinition tableDefinition) =>
+            this.BackendHelper.CreateRow(this.Section, symbol, this.Output, tableDefinition);
 
         private static string GetMsiFilenameValue(string shortName, string longName)
         {
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CreatePatchTransformsCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CreatePatchTransformsCommand.cs
index f65f885b..76e6dd56 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CreatePatchTransformsCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CreatePatchTransformsCommand.cs
@@ -9,7 +9,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Core.WindowsInstaller.Unbind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility.Services;
 
@@ -34,16 +34,16 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         {
             var patchTransforms = new List<PatchTransform>();
 
-            var tuples = this.Intermediate.Sections.SelectMany(s => s.Tuples).OfType<WixPatchBaselineTuple>();
+            var symbols = this.Intermediate.Sections.SelectMany(s => s.Symbols).OfType<WixPatchBaselineSymbol>();
 
-            foreach (var tuple in tuples)
+            foreach (var symbol in symbols)
             {
                 WindowsInstallerData transform;
 
-                if (tuple.TransformFile is null)
+                if (symbol.TransformFile is null)
                 {
-                    var baselineData = this.GetData(tuple.BaselineFile.Path);
-                    var updateData = this.GetData(tuple.UpdateFile.Path);
+                    var baselineData = this.GetData(symbol.BaselineFile.Path);
+                    var updateData = this.GetData(symbol.UpdateFile.Path);
 
                     var command = new GenerateTransformCommand(this.Messaging, baselineData, updateData, preserveUnchangedRows: true, showPedanticMessages: false);
                     transform = command.Execute();
@@ -52,11 +52,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 {
                     var exportBasePath = Path.Combine(this.IntermediateFolder, "_trans"); // TODO: come up with a better path.
 
-                    var command = new UnbindTransformCommand(this.Messaging, tuple.TransformFile.Path, exportBasePath, this.IntermediateFolder);
+                    var command = new UnbindTransformCommand(this.Messaging, symbol.TransformFile.Path, exportBasePath, this.IntermediateFolder);
                     transform = command.Execute();
                 }
 
-                patchTransforms.Add(new PatchTransform(tuple.Id.Id, transform));
+                patchTransforms.Add(new PatchTransform(symbol.Id.Id, transform));
             }
 
             this.PatchTransforms = patchTransforms;
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/CreateSpecialPropertiesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/CreateSpecialPropertiesCommand.cs
index 5b4fe9e5..0a042f48 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/CreateSpecialPropertiesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/CreateSpecialPropertiesCommand.cs
@@ -6,7 +6,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Collections.Generic;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
 
     internal class CreateSpecialPropertiesCommand
     {
@@ -24,7 +24,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             var secureProperties = new SortedSet<string>();
             var hiddenProperties = new SortedSet<string>();
 
-            foreach (var wixPropertyRow in this.Section.Tuples.OfType<WixPropertyTuple>())
+            foreach (var wixPropertyRow in this.Section.Symbols.OfType<WixPropertySymbol>())
             {
                 if (wixPropertyRow.Admin)
                 {
@@ -43,7 +43,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             }
 
             // Hide properties for in-script custom actions that have HideTarget set.
-            var hideTargetCustomActions = this.Section.Tuples.OfType<CustomActionTuple>().Where(
+            var hideTargetCustomActions = this.Section.Symbols.OfType<CustomActionSymbol>().Where(
                 ca => ca.Hidden
                 && (ca.ExecutionType == CustomActionExecutionType.Deferred
                 || ca.ExecutionType == CustomActionExecutionType.Commit
@@ -52,12 +52,12 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             hiddenProperties.UnionWith(hideTargetCustomActions);
 
             // Ensure upgrade action properties are secure.
-            var actionProperties = this.Section.Tuples.OfType<UpgradeTuple>().Select(u => u.ActionProperty);
+            var actionProperties = this.Section.Symbols.OfType<UpgradeSymbol>().Select(u => u.ActionProperty);
             secureProperties.UnionWith(actionProperties);
 
             if (0 < adminProperties.Count)
             {
-                this.Section.AddTuple(new PropertyTuple(null, new Identifier(AccessModifier.Private, "AdminProperties"))
+                this.Section.AddSymbol(new PropertySymbol(null, new Identifier(AccessModifier.Private, "AdminProperties"))
                 {
                     Value = String.Join(";", adminProperties),
                 });
@@ -65,7 +65,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             if (0 < secureProperties.Count)
             {
-                this.Section.AddTuple(new PropertyTuple(null, new Identifier(AccessModifier.Private, "SecureCustomProperties"))
+                this.Section.AddSymbol(new PropertySymbol(null, new Identifier(AccessModifier.Private, "SecureCustomProperties"))
                 {
                     Value = String.Join(";", secureProperties),
                 });
@@ -73,7 +73,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             if (0 < hiddenProperties.Count)
             {
-                this.Section.AddTuple(new PropertyTuple(null, new Identifier(AccessModifier.Private, "MsiHiddenProperties"))
+                this.Section.AddSymbol(new PropertySymbol(null, new Identifier(AccessModifier.Private, "MsiHiddenProperties"))
                 {
                     Value = String.Join(";", hiddenProperties)
                 });
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/ExtractMergeModuleFilesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/ExtractMergeModuleFilesCommand.cs
index 792a13a9..37bda235 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/ExtractMergeModuleFilesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/ExtractMergeModuleFilesCommand.cs
@@ -12,7 +12,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using WixToolset.Data;
     using WixToolset.Core.Native;
     using WixToolset.Core.Bind;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Extensibility.Services;
     using WixToolset.Core.WindowsInstaller.Msi;
 
@@ -21,10 +21,10 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     /// </summary>
     internal class ExtractMergeModuleFilesCommand
     {
-        public ExtractMergeModuleFilesCommand(IMessaging messaging, IEnumerable<WixMergeTuple> wixMergeTuples, IEnumerable<FileFacade> fileFacades, int installerVersion, string intermediateFolder, bool suppressLayout)
+        public ExtractMergeModuleFilesCommand(IMessaging messaging, IEnumerable<WixMergeSymbol> wixMergeSymbols, IEnumerable<FileFacade> fileFacades, int installerVersion, string intermediateFolder, bool suppressLayout)
         {
             this.Messaging = messaging;
-            this.WixMergeTuples = wixMergeTuples;
+            this.WixMergeSymbols = wixMergeSymbols;
             this.FileFacades = fileFacades;
             this.OutputInstallerVersion = installerVersion;
             this.IntermediateFolder = intermediateFolder;
@@ -33,7 +33,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         private IMessaging Messaging { get; }
 
-        private IEnumerable<WixMergeTuple> WixMergeTuples { get; }
+        private IEnumerable<WixMergeSymbol> WixMergeSymbols { get; }
 
         private IEnumerable<FileFacade> FileFacades { get; }
 
@@ -61,7 +61,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             // is a lot more costly for the common cases.
             var indexedFileFacades = this.FileFacades.ToDictionary(f => f.Id, StringComparer.Ordinal);
 
-            foreach (var wixMergeRow in this.WixMergeTuples)
+            foreach (var wixMergeRow in this.WixMergeSymbols)
             {
                 var containsFiles = this.CreateFacadesForMergeModuleFiles(wixMergeRow, mergeModulesFileFacades, indexedFileFacades);
 
@@ -75,7 +75,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             this.MergeModulesFileFacades = mergeModulesFileFacades;
         }
 
-        private bool CreateFacadesForMergeModuleFiles(WixMergeTuple wixMergeRow, List<FileFacade> mergeModulesFileFacades, Dictionary<string, FileFacade> indexedFileFacades)
+        private bool CreateFacadesForMergeModuleFiles(WixMergeSymbol wixMergeRow, List<FileFacade> mergeModulesFileFacades, Dictionary<string, FileFacade> indexedFileFacades)
         {
             var containsFiles = false;
 
@@ -96,13 +96,13 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                                 // NOTE: this is very tricky - the merge module file rows are not added to the
                                 // file table because they should not be created via idt import.  Instead, these
                                 // rows are created by merging in the actual modules.
-                                var fileTuple = new FileTuple(wixMergeRow.SourceLineNumbers, new Identifier(AccessModifier.Private, record[1]));
-                                fileTuple.Attributes = wixMergeRow.FileAttributes;
-                                fileTuple.DirectoryRef = record[2];
-                                fileTuple.DiskId = wixMergeRow.DiskId;
-                                fileTuple.Source = new IntermediateFieldPathValue { Path = Path.Combine(this.IntermediateFolder, wixMergeRow.Id.Id, record[1]) };
+                                var fileSymbol = new FileSymbol(wixMergeRow.SourceLineNumbers, new Identifier(AccessModifier.Private, record[1]));
+                                fileSymbol.Attributes = wixMergeRow.FileAttributes;
+                                fileSymbol.DirectoryRef = record[2];
+                                fileSymbol.DiskId = wixMergeRow.DiskId;
+                                fileSymbol.Source = new IntermediateFieldPathValue { Path = Path.Combine(this.IntermediateFolder, wixMergeRow.Id.Id, record[1]) };
 
-                                var mergeModuleFileFacade = new FileFacade(true, fileTuple);
+                                var mergeModuleFileFacade = new FileFacade(true, fileSymbol);
 
                                 // If case-sensitive collision with another merge module or a user-authored file identifier.
                                 if (indexedFileFacades.TryGetValue(mergeModuleFileFacade.Id, out var collidingFacade))
@@ -159,7 +159,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return containsFiles;
         }
 
-        private void ExtractFilesFromMergeModule(IMsmMerge2 merge, WixMergeTuple wixMergeRow)
+        private void ExtractFilesFromMergeModule(IMsmMerge2 merge, WixMergeSymbol wixMergeRow)
         {
             var moduleOpen = false;
             short mergeLanguage;
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/GenerateTransformCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/GenerateTransformCommand.cs
index fc713954..121ffb1b 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/GenerateTransformCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/GenerateTransformCommand.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core.WindowsInstaller
     using System.Globalization;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility.Services;
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/GetFileFacadesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/GetFileFacadesCommand.cs
index 55171da4..c918e866 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/GetFileFacadesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/GetFileFacadesCommand.cs
@@ -8,7 +8,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Linq;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
 
     internal class GetFileFacadesCommand
     {
@@ -25,10 +25,10 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         {
             var facades = new List<FileFacade>();
 
-            var assemblyFile = this.Section.Tuples.OfType<AssemblyTuple>().ToDictionary(t => t.Id.Id);
-            //var deltaPatchFiles = this.Section.Tuples.OfType<WixDeltaPatchFileTuple>().ToDictionary(t => t.Id.Id);
+            var assemblyFile = this.Section.Symbols.OfType<AssemblySymbol>().ToDictionary(t => t.Id.Id);
+            //var deltaPatchFiles = this.Section.Symbols.OfType<WixDeltaPatchFileSymbol>().ToDictionary(t => t.Id.Id);
 
-            foreach (var file in this.Section.Tuples.OfType<FileTuple>())
+            foreach (var file in this.Section.Symbols.OfType<FileSymbol>())
             {
                 assemblyFile.TryGetValue(file.Id.Id, out var assembly);
 
@@ -49,13 +49,13 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// <summary>
         /// Merge data from the WixPatchSymbolPaths rows into the WixDeltaPatchFile rows.
         /// </summary>
-        public void ResolveDeltaPatchSymbolPaths(Dictionary<string, WixDeltaPatchFileTuple> deltaPatchFiles, IEnumerable<FileFacade> facades)
+        public void ResolveDeltaPatchSymbolPaths(Dictionary<string, WixDeltaPatchFileSymbol> deltaPatchFiles, IEnumerable<FileFacade> facades)
         {
             ILookup<string, FileFacade> filesByComponent = null;
             ILookup<string, FileFacade> filesByDirectory = null;
             ILookup<string, FileFacade> filesByDiskId = null;
 
-            foreach (var row in this.Section.Tuples.OfType<WixDeltaPatchSymbolPathsTuple>().OrderBy(r => r.SymbolType))
+            foreach (var row in this.Section.Symbols.OfType<WixDeltaPatchSymbolPathsSymbol>().OrderBy(r => r.SymbolType))
             {
                 switch (row.SymbolType)
                 {
@@ -119,7 +119,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// <param name="row">Row from the WixPatchSymbolsPaths table.</param>
         /// <param name="file">FileRow into which to set symbol information.</param>
         /// <comment>This includes PreviousData as well.</comment>
-        private void MergeSymbolPaths(WixDeltaPatchSymbolPathsTuple row, WixDeltaPatchFileTuple file)
+        private void MergeSymbolPaths(WixDeltaPatchSymbolPathsSymbol row, WixDeltaPatchFileSymbol file)
         {
             if (file.SymbolPaths is null)
             {
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/LoadTableDefinitionsCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/LoadTableDefinitionsCommand.cs
index 0312ab44..2eb95bc5 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/LoadTableDefinitionsCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/LoadTableDefinitionsCommand.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Globalization;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility;
     using WixToolset.Extensibility.Services;
@@ -32,13 +32,13 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         public TableDefinitionCollection Execute()
         {
             var tableDefinitions = new TableDefinitionCollection(WindowsInstallerTableDefinitions.All);
-            var customColumnsById = this.Section.Tuples.OfType<WixCustomTableColumnTuple>().ToDictionary(t => t.Id.Id);
+            var customColumnsById = this.Section.Symbols.OfType<WixCustomTableColumnSymbol>().ToDictionary(t => t.Id.Id);
 
             if (customColumnsById.Any())
             {
-                foreach (var tuple in this.Section.Tuples.OfType<WixCustomTableTuple>())
+                foreach (var symbol in this.Section.Symbols.OfType<WixCustomTableSymbol>())
                 {
-                    var customTableDefinition = this.CreateCustomTable(tuple, customColumnsById);
+                    var customTableDefinition = this.CreateCustomTable(symbol, customColumnsById);
                     tableDefinitions.Add(customTableDefinition);
                 }
             }
@@ -60,14 +60,14 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return this.TableDefinitions;
         }
 
-        private TableDefinition CreateCustomTable(WixCustomTableTuple tuple, Dictionary<string, WixCustomTableColumnTuple> customColumnsById)
+        private TableDefinition CreateCustomTable(WixCustomTableSymbol symbol, Dictionary<string, WixCustomTableColumnSymbol> customColumnsById)
         {
-            var columnNames = tuple.ColumnNamesSeparated;
+            var columnNames = symbol.ColumnNamesSeparated;
             var columns = new List<ColumnDefinition>(columnNames.Length);
 
             foreach (var name in columnNames)
             {
-                var column = customColumnsById[tuple.Id.Id + "/" + name];
+                var column = customColumnsById[symbol.Id.Id + "/" + name];
 
                 var type = ColumnType.Unknown;
 
@@ -208,7 +208,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 columns.Add(columnDefinition);
             }
 
-            var customTable = new TableDefinition(tuple.Id.Id, null, columns, tuple.Unreal);
+            var customTable = new TableDefinition(symbol.Id.Id, null, columns, symbol.Unreal);
             return customTable;
         }
     }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/MergeModulesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/MergeModulesCommand.cs
index 1f85a33f..80684e7c 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/MergeModulesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/MergeModulesCommand.cs
@@ -13,7 +13,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using WixToolset.Core.Native;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility.Services;
 
@@ -46,8 +46,8 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            var wixMergeTuples = this.Section.Tuples.OfType<WixMergeTuple>().ToList();
-            if (!wixMergeTuples.Any())
+            var wixMergeSymbols = this.Section.Symbols.OfType<WixMergeSymbol>().ToList();
+            if (!wixMergeSymbols.Any())
             {
                 return;
             }
@@ -69,10 +69,10 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 merge.OpenDatabase(this.OutputPath);
                 databaseOpen = true;
 
-                var featureModulesByMergeId = this.Section.Tuples.OfType<WixFeatureModulesTuple>().GroupBy(t => t.WixMergeRef).ToDictionary(g => g.Key);
+                var featureModulesByMergeId = this.Section.Symbols.OfType<WixFeatureModulesSymbol>().GroupBy(t => t.WixMergeRef).ToDictionary(g => g.Key);
 
                 // process all the merge rows
-                foreach (var wixMergeRow in wixMergeTuples)
+                foreach (var wixMergeRow in wixMergeSymbols)
                 {
                     var moduleOpen = false;
 
@@ -217,7 +217,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             using (var db = new Database(this.OutputPath, OpenDatabase.Direct))
             {
                 // Suppress individual actions.
-                foreach (var suppressAction in this.Section.Tuples.OfType<WixSuppressActionTuple>())
+                foreach (var suppressAction in this.Section.Symbols.OfType<WixSuppressActionSymbol>())
                 {
                     var tableName = suppressAction.SequenceTable.WindowsInstallerTableName();
                     if (db.TableExists(tableName))
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/ModularizeCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/ModularizeCommand.cs
index 8b459d69..66ca502d 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/ModularizeCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/ModularizeCommand.cs
@@ -10,18 +10,18 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Text;
     using System.Text.RegularExpressions;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
 
     internal class ModularizeCommand
     {
-        public ModularizeCommand(WindowsInstallerData output, string modularizationSuffix, IEnumerable<WixSuppressModularizationTuple> suppressTuples)
+        public ModularizeCommand(WindowsInstallerData output, string modularizationSuffix, IEnumerable<WixSuppressModularizationSymbol> suppressSymbols)
         {
             this.Output = output;
             this.ModularizationSuffix = modularizationSuffix;
 
             // Gather all the unique suppress modularization identifiers.
-            this.SuppressModularizationIdentifiers = new HashSet<string>(suppressTuples.Select(s => s.Id.Id));
+            this.SuppressModularizationIdentifiers = new HashSet<string>(suppressSymbols.Select(s => s.Id.Id));
         }
 
         private WindowsInstallerData Output { get; }
@@ -144,17 +144,17 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         {
                             Debug.Assert(ColumnModularizeType.Condition == modularizeType);
 
-                            // This heinous looking regular expression is actually quite an elegant way 
-                            // to shred the entire condition into the identifiers that need to be 
+                            // This heinous looking regular expression is actually quite an elegant way
+                            // to shred the entire condition into the identifiers that need to be
                             // modularized.  Let's break it down piece by piece:
                             //
                             // 1. Look for the operators: NOT, EQV, XOR, OR, AND, IMP (plus a space).  Note that the
                             //    regular expression is case insensitive so we don't have to worry about
                             //    all the permutations of these strings.
-                            // 2. Look for quoted strings.  Quoted strings are just text and are ignored 
+                            // 2. Look for quoted strings.  Quoted strings are just text and are ignored
                             //    outright.
-                            // 3. Look for environment variables.  These look like identifiers we might 
-                            //    otherwise be interested in but start with a percent sign.  Like quoted 
+                            // 3. Look for environment variables.  These look like identifiers we might
+                            //    otherwise be interested in but start with a percent sign.  Like quoted
                             //    strings these enviroment variable references are ignored outright.
                             // 4. Match all identifiers that are things that need to be modularized.  Note
                             //    the special characters (!, $, ?, &) that denote Component and Feature states.
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/ProcessUncompressedFilesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/ProcessUncompressedFilesCommand.cs
index 13d47215..ab5ebd4b 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/ProcessUncompressedFilesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/ProcessUncompressedFilesCommand.cs
@@ -9,7 +9,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using WixToolset.Core.Bind;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Extensibility.Data;
     using WixToolset.Extensibility.Services;
 
@@ -41,7 +41,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public bool LongNamesInImage { private get; set; }
 
-        public Func<MediaTuple, string, string, string> ResolveMedia { private get; set; }
+        public Func<MediaSymbol, string, string, string> ResolveMedia { private get; set; }
 
         public IEnumerable<IFileTransfer> FileTransfers { get; private set; }
 
@@ -55,7 +55,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             var directories = new Dictionary<string, IResolvedDirectory>();
 
-            var mediaRows = this.Section.Tuples.OfType<MediaTuple>().ToDictionary(t => t.DiskId);
+            var mediaRows = this.Section.Symbols.OfType<MediaSymbol>().ToDictionary(t => t.DiskId);
 
             using (var db = new Database(this.DatabasePath, OpenDatabase.ReadOnly))
             {
@@ -78,11 +78,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         // for each file in the array of uncompressed files
                         foreach (FileFacade facade in this.FileFacades)
                         {
-                            var mediaTuple = mediaRows[facade.DiskId];
+                            var mediaSymbol = mediaRows[facade.DiskId];
                             string relativeFileLayoutPath = null;
-                            string mediaLayoutFolder = mediaTuple.Layout;
+                            string mediaLayoutFolder = mediaSymbol.Layout;
 
-                            var mediaLayoutDirectory = this.ResolveMedia(mediaTuple, mediaLayoutFolder, this.LayoutDirectory);
+                            var mediaLayoutDirectory = this.ResolveMedia(mediaSymbol, mediaLayoutFolder, this.LayoutDirectory);
 
                             // setup up the query record and find the appropriate file in the
                             // previously executed file view
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/SequenceActionsCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/SequenceActionsCommand.cs
index a5055209..7f43da9a 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/SequenceActionsCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/SequenceActionsCommand.cs
@@ -7,12 +7,12 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Globalization;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility.Services;
 
     /// <summary>
-    /// Set sequence numbers for all the actions and create tuples in the output object.
+    /// Set sequence numbers for all the actions and create symbols in the output object.
     /// </summary>
     internal class SequenceActionsCommand
     {
@@ -32,38 +32,38 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            var requiredActionTuples = new Dictionary<string, WixActionTuple>();
+            var requiredActionSymbols = new Dictionary<string, WixActionSymbol>();
 
-            // Get the standard actions required based on tuples in the section.
-            var overridableActionTuples = this.GetRequiredStandardActions();
+            // Get the standard actions required based on symbols in the section.
+            var overridableActionSymbols = this.GetRequiredStandardActions();
 
-            // Index all the action tuples and look for collisions.
-            foreach (var actionTuple in this.Section.Tuples.OfType<WixActionTuple>())
+            // Index all the action symbols and look for collisions.
+            foreach (var actionSymbol in this.Section.Symbols.OfType<WixActionSymbol>())
             {
-                if (actionTuple.Overridable) // overridable action
+                if (actionSymbol.Overridable) // overridable action
                 {
-                    if (overridableActionTuples.TryGetValue(actionTuple.Id.Id, out var collidingActionTuple))
+                    if (overridableActionSymbols.TryGetValue(actionSymbol.Id.Id, out var collidingActionSymbol))
                     {
-                        this.Messaging.Write(ErrorMessages.OverridableActionCollision(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action));
-                        if (null != collidingActionTuple.SourceLineNumbers)
+                        this.Messaging.Write(ErrorMessages.OverridableActionCollision(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action));
+                        if (null != collidingActionSymbol.SourceLineNumbers)
                         {
-                            this.Messaging.Write(ErrorMessages.OverridableActionCollision2(collidingActionTuple.SourceLineNumbers));
+                            this.Messaging.Write(ErrorMessages.OverridableActionCollision2(collidingActionSymbol.SourceLineNumbers));
                         }
                     }
                     else
                     {
-                        overridableActionTuples.Add(actionTuple.Id.Id, actionTuple);
+                        overridableActionSymbols.Add(actionSymbol.Id.Id, actionSymbol);
                     }
                 }
                 else // unsequenced or sequenced action.
                 {
                     // Unsequenced action (allowed for certain standard actions).
-                    if (null == actionTuple.Before && null == actionTuple.After && !actionTuple.Sequence.HasValue)
+                    if (null == actionSymbol.Before && null == actionSymbol.After && !actionSymbol.Sequence.HasValue)
                     {
-                        if (WindowsInstallerStandard.TryGetStandardAction(actionTuple.Id.Id, out var standardAction))
+                        if (WindowsInstallerStandard.TryGetStandardAction(actionSymbol.Id.Id, out var standardAction))
                         {
                             // Populate the sequence from the standard action
-                            actionTuple.Sequence = standardAction.Sequence;
+                            actionSymbol.Sequence = standardAction.Sequence;
                         }
                         else // not a supported unscheduled action.
                         {
@@ -71,109 +71,109 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         }
                     }
 
-                    if (requiredActionTuples.TryGetValue(actionTuple.Id.Id, out var collidingActionTuple))
+                    if (requiredActionSymbols.TryGetValue(actionSymbol.Id.Id, out var collidingActionSymbol))
                     {
-                        this.Messaging.Write(ErrorMessages.ActionCollision(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action));
-                        if (null != collidingActionTuple.SourceLineNumbers)
+                        this.Messaging.Write(ErrorMessages.ActionCollision(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action));
+                        if (null != collidingActionSymbol.SourceLineNumbers)
                         {
-                            this.Messaging.Write(ErrorMessages.ActionCollision2(collidingActionTuple.SourceLineNumbers));
+                            this.Messaging.Write(ErrorMessages.ActionCollision2(collidingActionSymbol.SourceLineNumbers));
                         }
                     }
                     else
                     {
-                        requiredActionTuples.Add(actionTuple.Id.Id, actionTuple);
+                        requiredActionSymbols.Add(actionSymbol.Id.Id, actionSymbol);
                     }
                 }
             }
 
-            // Add the overridable action tuples that are not overridden to the required action tuples.
-            foreach (var actionTuple in overridableActionTuples.Values)
+            // Add the overridable action symbols that are not overridden to the required action symbols.
+            foreach (var actionSymbol in overridableActionSymbols.Values)
             {
-                if (!requiredActionTuples.ContainsKey(actionTuple.Id.Id))
+                if (!requiredActionSymbols.ContainsKey(actionSymbol.Id.Id))
                 {
-                    requiredActionTuples.Add(actionTuple.Id.Id, actionTuple);
+                    requiredActionSymbols.Add(actionSymbol.Id.Id, actionSymbol);
                 }
             }
 
             // Suppress the required actions that are overridable.
-            foreach (var suppressActionTuple in this.Section.Tuples.OfType<WixSuppressActionTuple>())
+            foreach (var suppressActionSymbol in this.Section.Symbols.OfType<WixSuppressActionSymbol>())
             {
-                var key = suppressActionTuple.Id.Id;
+                var key = suppressActionSymbol.Id.Id;
 
-                // If there is an overridable tuple to suppress; suppress it. There is no warning if there
+                // If there is an overridable symbol to suppress; suppress it. There is no warning if there
                 // is no action to suppress because the action may be suppressed from a merge module in
                 // the binder.
-                if (requiredActionTuples.TryGetValue(key, out var requiredActionTuple))
+                if (requiredActionSymbols.TryGetValue(key, out var requiredActionSymbol))
                 {
-                    if (requiredActionTuple.Overridable)
+                    if (requiredActionSymbol.Overridable)
                     {
-                        this.Messaging.Write(WarningMessages.SuppressAction(suppressActionTuple.SourceLineNumbers, suppressActionTuple.Action, suppressActionTuple.SequenceTable.ToString()));
-                        if (null != requiredActionTuple.SourceLineNumbers)
+                        this.Messaging.Write(WarningMessages.SuppressAction(suppressActionSymbol.SourceLineNumbers, suppressActionSymbol.Action, suppressActionSymbol.SequenceTable.ToString()));
+                        if (null != requiredActionSymbol.SourceLineNumbers)
                         {
-                            this.Messaging.Write(WarningMessages.SuppressAction2(requiredActionTuple.SourceLineNumbers));
+                            this.Messaging.Write(WarningMessages.SuppressAction2(requiredActionSymbol.SourceLineNumbers));
                         }
 
-                        requiredActionTuples.Remove(key);
+                        requiredActionSymbols.Remove(key);
                     }
-                    else // suppressing a non-overridable action tuple
+                    else // suppressing a non-overridable action symbol
                     {
-                        this.Messaging.Write(ErrorMessages.SuppressNonoverridableAction(suppressActionTuple.SourceLineNumbers, suppressActionTuple.SequenceTable.ToString(), suppressActionTuple.Action));
-                        if (null != requiredActionTuple.SourceLineNumbers)
+                        this.Messaging.Write(ErrorMessages.SuppressNonoverridableAction(suppressActionSymbol.SourceLineNumbers, suppressActionSymbol.SequenceTable.ToString(), suppressActionSymbol.Action));
+                        if (null != requiredActionSymbol.SourceLineNumbers)
                         {
-                            this.Messaging.Write(ErrorMessages.SuppressNonoverridableAction2(requiredActionTuple.SourceLineNumbers));
+                            this.Messaging.Write(ErrorMessages.SuppressNonoverridableAction2(requiredActionSymbol.SourceLineNumbers));
                         }
                     }
                 }
             }
 
             // Build up dependency trees of the relatively scheduled actions.
-            // Use ToList() to create a copy of the required action tuples so that new tuples can
+            // Use ToList() to create a copy of the required action symbols so that new symbols can
             // be added while enumerating.
-            foreach (var actionTuple in requiredActionTuples.Values.ToList())
+            foreach (var actionSymbol in requiredActionSymbols.Values.ToList())
             {
-                if (!actionTuple.Sequence.HasValue)
+                if (!actionSymbol.Sequence.HasValue)
                 {
                     // check for standard actions that don't have a sequence number in a merge module
-                    if (SectionType.Module == this.Section.Type && WindowsInstallerStandard.IsStandardAction(actionTuple.Action))
+                    if (SectionType.Module == this.Section.Type && WindowsInstallerStandard.IsStandardAction(actionSymbol.Action))
                     {
-                        this.Messaging.Write(ErrorMessages.StandardActionRelativelyScheduledInModule(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action));
+                        this.Messaging.Write(ErrorMessages.StandardActionRelativelyScheduledInModule(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action));
                     }
 
-                    this.SequenceActionTuple(actionTuple, requiredActionTuples);
+                    this.SequenceActionSymbol(actionSymbol, requiredActionSymbols);
                 }
-                else if (SectionType.Module == this.Section.Type && 0 < actionTuple.Sequence && !WindowsInstallerStandard.IsStandardAction(actionTuple.Action)) // check for custom actions and dialogs that have a sequence number
+                else if (SectionType.Module == this.Section.Type && 0 < actionSymbol.Sequence && !WindowsInstallerStandard.IsStandardAction(actionSymbol.Action)) // check for custom actions and dialogs that have a sequence number
                 {
-                    this.Messaging.Write(ErrorMessages.CustomActionSequencedInModule(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action));
+                    this.Messaging.Write(ErrorMessages.CustomActionSequencedInModule(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action));
                 }
             }
 
             // Look for standard actions with sequence restrictions that aren't necessarily scheduled based
             // on the presence of a particular table.
-            if (requiredActionTuples.ContainsKey("InstallExecuteSequence/DuplicateFiles") && !requiredActionTuples.ContainsKey("InstallExecuteSequence/InstallFiles"))
+            if (requiredActionSymbols.ContainsKey("InstallExecuteSequence/DuplicateFiles") && !requiredActionSymbols.ContainsKey("InstallExecuteSequence/InstallFiles"))
             {
                 WindowsInstallerStandard.TryGetStandardAction("InstallExecuteSequence/InstallFiles", out var standardAction);
-                requiredActionTuples.Add(standardAction.Id.Id, standardAction);
+                requiredActionSymbols.Add(standardAction.Id.Id, standardAction);
             }
 
             // Schedule actions.
-            List<WixActionTuple> scheduledActionTuples;
+            List<WixActionSymbol> scheduledActionSymbols;
             if (SectionType.Module == this.Section.Type)
             {
-                scheduledActionTuples = requiredActionTuples.Values.ToList();
+                scheduledActionSymbols = requiredActionSymbols.Values.ToList();
             }
             else
             {
-                scheduledActionTuples = this.ScheduleActions(requiredActionTuples);
+                scheduledActionSymbols = this.ScheduleActions(requiredActionSymbols);
             }
 
-            // Remove all existing WixActionTuples from the section then add the
+            // Remove all existing WixActionSymbols from the section then add the
             // scheduled actions back to the section. Note: we add the indices in
             // reverse order to make it easy to remove them from the list later.
             var removeIndices = new List<int>();
-            for (var i = this.Section.Tuples.Count - 1; i >= 0; --i)
+            for (var i = this.Section.Symbols.Count - 1; i >= 0; --i)
             {
-                var tuple = this.Section.Tuples[i];
-                if (tuple.Definition.Type == TupleDefinitionType.WixAction)
+                var symbol = this.Section.Symbols[i];
+                if (symbol.Definition.Type == SymbolDefinitionType.WixAction)
                 {
                     removeIndices.Add(i);
                 }
@@ -181,164 +181,164 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
             foreach (var removeIndex in removeIndices)
             {
-                this.Section.Tuples.RemoveAt(removeIndex);
+                this.Section.Symbols.RemoveAt(removeIndex);
             }
 
-            foreach (var action in scheduledActionTuples)
+            foreach (var action in scheduledActionSymbols)
             {
-                this.Section.AddTuple(action);
+                this.Section.AddSymbol(action);
             }
         }
 
-        private Dictionary<string, WixActionTuple> GetRequiredStandardActions()
+        private Dictionary<string, WixActionSymbol> GetRequiredStandardActions()
         {
-            var overridableActionTuples = new Dictionary<string, WixActionTuple>();
+            var overridableActionSymbols = new Dictionary<string, WixActionSymbol>();
 
             var requiredActionIds = this.GetRequiredActionIds();
 
             foreach (var actionId in requiredActionIds)
             {
                 WindowsInstallerStandard.TryGetStandardAction(actionId, out var standardAction);
-                overridableActionTuples.Add(standardAction.Id.Id, standardAction);
+                overridableActionSymbols.Add(standardAction.Id.Id, standardAction);
             }
 
-            return overridableActionTuples;
+            return overridableActionSymbols;
         }
 
-        private List<WixActionTuple> ScheduleActions(Dictionary<string, WixActionTuple> requiredActionTuples)
+        private List<WixActionSymbol> ScheduleActions(Dictionary<string, WixActionSymbol> requiredActionSymbols)
         {
-            var scheduledActionTuples = new List<WixActionTuple>();
+            var scheduledActionSymbols = new List<WixActionSymbol>();
 
             // Process each sequence table individually.
             foreach (SequenceTable sequenceTable in Enum.GetValues(typeof(SequenceTable)))
             {
-                // Create a collection of just the action tuples in this sequence
-                var sequenceActionTuples = requiredActionTuples.Values.Where(a => a.SequenceTable == sequenceTable).ToList();
+                // Create a collection of just the action symbols in this sequence
+                var sequenceActionSymbols = requiredActionSymbols.Values.Where(a => a.SequenceTable == sequenceTable).ToList();
 
                 // Schedule the absolutely scheduled actions (by sorting them by their sequence numbers).
-                var absoluteActionTuples = new List<WixActionTuple>();
-                foreach (var actionTuple in sequenceActionTuples)
+                var absoluteActionSymbols = new List<WixActionSymbol>();
+                foreach (var actionSymbol in sequenceActionSymbols)
                 {
-                    if (actionTuple.Sequence.HasValue)
+                    if (actionSymbol.Sequence.HasValue)
                     {
                         // Look for sequence number collisions
-                        foreach (var sequenceScheduledActionTuple in absoluteActionTuples)
+                        foreach (var sequenceScheduledActionSymbol in absoluteActionSymbols)
                         {
-                            if (sequenceScheduledActionTuple.Sequence == actionTuple.Sequence)
+                            if (sequenceScheduledActionSymbol.Sequence == actionSymbol.Sequence)
                             {
-                                this.Messaging.Write(WarningMessages.ActionSequenceCollision(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action, sequenceScheduledActionTuple.Action, actionTuple.Sequence ?? 0));
-                                if (null != sequenceScheduledActionTuple.SourceLineNumbers)
+                                this.Messaging.Write(WarningMessages.ActionSequenceCollision(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action, sequenceScheduledActionSymbol.Action, actionSymbol.Sequence ?? 0));
+                                if (null != sequenceScheduledActionSymbol.SourceLineNumbers)
                                 {
-                                    this.Messaging.Write(WarningMessages.ActionSequenceCollision2(sequenceScheduledActionTuple.SourceLineNumbers));
+                                    this.Messaging.Write(WarningMessages.ActionSequenceCollision2(sequenceScheduledActionSymbol.SourceLineNumbers));
                                 }
                             }
                         }
 
-                        absoluteActionTuples.Add(actionTuple);
+                        absoluteActionSymbols.Add(actionSymbol);
                     }
                 }
 
-                absoluteActionTuples.Sort((x, y) => (x.Sequence ?? 0).CompareTo(y.Sequence ?? 0));
+                absoluteActionSymbols.Sort((x, y) => (x.Sequence ?? 0).CompareTo(y.Sequence ?? 0));
 
                 // Schedule the relatively scheduled actions (by resolving the dependency trees).
                 var previousUsedSequence = 0;
-                var relativeActionTuples = new List<WixActionTuple>();
-                for (int j = 0; j < absoluteActionTuples.Count; j++)
+                var relativeActionSymbols = new List<WixActionSymbol>();
+                for (int j = 0; j < absoluteActionSymbols.Count; j++)
                 {
-                    var absoluteActionTuple = absoluteActionTuples[j];
+                    var absoluteActionSymbol = absoluteActionSymbols[j];
 
-                    // Get all the relatively scheduled action tuples occuring before and after this absolutely scheduled action tuple.
-                    var relativeActions = this.GetAllRelativeActionsForSequenceType(sequenceTable, absoluteActionTuple);
+                    // Get all the relatively scheduled action symbols occuring before and after this absolutely scheduled action symbol.
+                    var relativeActions = this.GetAllRelativeActionsForSequenceType(sequenceTable, absoluteActionSymbol);
 
                     // Check for relatively scheduled actions occuring before/after a special action
                     // (those actions with a negative sequence number).
-                    if (absoluteActionTuple.Sequence < 0 && (relativeActions.PreviousActions.Any() || relativeActions.NextActions.Any()))
+                    if (absoluteActionSymbol.Sequence < 0 && (relativeActions.PreviousActions.Any() || relativeActions.NextActions.Any()))
                     {
                         // Create errors for all the before actions.
-                        foreach (var actionTuple in relativeActions.PreviousActions)
+                        foreach (var actionSymbol in relativeActions.PreviousActions)
                         {
-                            this.Messaging.Write(ErrorMessages.ActionScheduledRelativeToTerminationAction(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action, absoluteActionTuple.Action));
+                            this.Messaging.Write(ErrorMessages.ActionScheduledRelativeToTerminationAction(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action, absoluteActionSymbol.Action));
                         }
 
                         // Create errors for all the after actions.
-                        foreach (var actionTuple in relativeActions.NextActions)
+                        foreach (var actionSymbol in relativeActions.NextActions)
                         {
-                            this.Messaging.Write(ErrorMessages.ActionScheduledRelativeToTerminationAction(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action, absoluteActionTuple.Action));
+                            this.Messaging.Write(ErrorMessages.ActionScheduledRelativeToTerminationAction(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action, absoluteActionSymbol.Action));
                         }
 
                         // If there is source line information for the absolutely scheduled action display it
-                        if (absoluteActionTuple.SourceLineNumbers != null)
+                        if (absoluteActionSymbol.SourceLineNumbers != null)
                         {
-                            this.Messaging.Write(ErrorMessages.ActionScheduledRelativeToTerminationAction2(absoluteActionTuple.SourceLineNumbers));
+                            this.Messaging.Write(ErrorMessages.ActionScheduledRelativeToTerminationAction2(absoluteActionSymbol.SourceLineNumbers));
                         }
 
                         continue;
                     }
 
-                    // Schedule the action tuples before this one.
-                    var unusedSequence = absoluteActionTuple.Sequence - 1;
+                    // Schedule the action symbols before this one.
+                    var unusedSequence = absoluteActionSymbol.Sequence - 1;
                     for (var i = relativeActions.PreviousActions.Count - 1; i >= 0; i--)
                     {
-                        var relativeActionTuple = relativeActions.PreviousActions[i];
+                        var relativeActionSymbol = relativeActions.PreviousActions[i];
 
                         // look for collisions
                         if (unusedSequence == previousUsedSequence)
                         {
-                            this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber(relativeActionTuple.SourceLineNumbers, relativeActionTuple.SequenceTable.ToString(), relativeActionTuple.Action, absoluteActionTuple.Action));
-                            if (absoluteActionTuple.SourceLineNumbers != null)
+                            this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber(relativeActionSymbol.SourceLineNumbers, relativeActionSymbol.SequenceTable.ToString(), relativeActionSymbol.Action, absoluteActionSymbol.Action));
+                            if (absoluteActionSymbol.SourceLineNumbers != null)
                             {
-                                this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber2(absoluteActionTuple.SourceLineNumbers));
+                                this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber2(absoluteActionSymbol.SourceLineNumbers));
                             }
 
                             unusedSequence++;
                         }
 
-                        relativeActionTuple.Sequence = unusedSequence;
-                        relativeActionTuples.Add(relativeActionTuple);
+                        relativeActionSymbol.Sequence = unusedSequence;
+                        relativeActionSymbols.Add(relativeActionSymbol);
 
                         unusedSequence--;
                     }
 
                     // Determine the next used action sequence number.
                     var nextUsedSequence = Int16.MaxValue + 1;
-                    if (absoluteActionTuples.Count > j + 1)
+                    if (absoluteActionSymbols.Count > j + 1)
                     {
-                        nextUsedSequence = absoluteActionTuples[j + 1].Sequence ?? 0;
+                        nextUsedSequence = absoluteActionSymbols[j + 1].Sequence ?? 0;
                     }
 
-                    // Schedule the action tuples after this one.
-                    unusedSequence = absoluteActionTuple.Sequence + 1;
+                    // Schedule the action symbols after this one.
+                    unusedSequence = absoluteActionSymbol.Sequence + 1;
                     for (var i = 0; i < relativeActions.NextActions.Count; i++)
                     {
-                        var relativeActionTuple = relativeActions.NextActions[i];
+                        var relativeActionSymbol = relativeActions.NextActions[i];
 
                         if (unusedSequence == nextUsedSequence)
                         {
-                            this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber(relativeActionTuple.SourceLineNumbers, relativeActionTuple.SequenceTable.ToString(), relativeActionTuple.Action, absoluteActionTuple.Action));
-                            if (absoluteActionTuple.SourceLineNumbers != null)
+                            this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber(relativeActionSymbol.SourceLineNumbers, relativeActionSymbol.SequenceTable.ToString(), relativeActionSymbol.Action, absoluteActionSymbol.Action));
+                            if (absoluteActionSymbol.SourceLineNumbers != null)
                             {
-                                this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber2(absoluteActionTuple.SourceLineNumbers));
+                                this.Messaging.Write(ErrorMessages.NoUniqueActionSequenceNumber2(absoluteActionSymbol.SourceLineNumbers));
                             }
 
                             unusedSequence--;
                         }
 
-                        relativeActionTuple.Sequence = unusedSequence;
-                        relativeActionTuples.Add(relativeActionTuple);
+                        relativeActionSymbol.Sequence = unusedSequence;
+                        relativeActionSymbols.Add(relativeActionSymbol);
 
                         unusedSequence++;
                     }
 
                     // keep track of this sequence number as the previous used sequence number for the next iteration
-                    previousUsedSequence = absoluteActionTuple.Sequence ?? 0;
+                    previousUsedSequence = absoluteActionSymbol.Sequence ?? 0;
                 }
 
                 // add the absolutely and relatively scheduled actions to the list of scheduled actions
-                scheduledActionTuples.AddRange(absoluteActionTuples);
-                scheduledActionTuples.AddRange(relativeActionTuples);
+                scheduledActionSymbols.AddRange(absoluteActionSymbols);
+                scheduledActionSymbols.AddRange(relativeActionSymbols);
             }
 
-            return scheduledActionTuples;
+            return scheduledActionSymbols;
         }
 
         private IEnumerable<string> GetRequiredActionIds()
@@ -396,16 +396,16 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 set.Add("InstallUISequence/ValidateProductID");
             }
 
-            // Gather the required actions for each tuple type.
-            foreach (var tupleType in this.Section.Tuples.Select(t => t.Definition.Type).Distinct())
+            // Gather the required actions for each symbol type.
+            foreach (var symbolType in this.Section.Symbols.Select(t => t.Definition.Type).Distinct())
             {
-                switch (tupleType)
+                switch (symbolType)
                 {
-                    case TupleDefinitionType.AppSearch:
+                    case SymbolDefinitionType.AppSearch:
                         set.Add("InstallExecuteSequence/AppSearch");
                         set.Add("InstallUISequence/AppSearch");
                         break;
-                    case TupleDefinitionType.CCPSearch:
+                    case SymbolDefinitionType.CCPSearch:
                         set.Add("InstallExecuteSequence/AppSearch");
                         set.Add("InstallExecuteSequence/CCPSearch");
                         set.Add("InstallExecuteSequence/RMCCPSearch");
@@ -413,40 +413,40 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                         set.Add("InstallUISequence/CCPSearch");
                         set.Add("InstallUISequence/RMCCPSearch");
                         break;
-                    case TupleDefinitionType.Class:
+                    case SymbolDefinitionType.Class:
                         set.Add("AdvertiseExecuteSequence/RegisterClassInfo");
                         set.Add("InstallExecuteSequence/RegisterClassInfo");
                         set.Add("InstallExecuteSequence/UnregisterClassInfo");
                         break;
-                    case TupleDefinitionType.Complus:
+                    case SymbolDefinitionType.Complus:
                         set.Add("InstallExecuteSequence/RegisterComPlus");
                         set.Add("InstallExecuteSequence/UnregisterComPlus");
                         break;
-                    case TupleDefinitionType.CreateFolder:
+                    case SymbolDefinitionType.CreateFolder:
                         set.Add("InstallExecuteSequence/CreateFolders");
                         set.Add("InstallExecuteSequence/RemoveFolders");
                         break;
-                    case TupleDefinitionType.DuplicateFile:
+                    case SymbolDefinitionType.DuplicateFile:
                         set.Add("InstallExecuteSequence/DuplicateFiles");
                         set.Add("InstallExecuteSequence/RemoveDuplicateFiles");
                         break;
-                    case TupleDefinitionType.Environment:
+                    case SymbolDefinitionType.Environment:
                         set.Add("InstallExecuteSequence/WriteEnvironmentStrings");
                         set.Add("InstallExecuteSequence/RemoveEnvironmentStrings");
                         break;
-                    case TupleDefinitionType.Extension:
+                    case SymbolDefinitionType.Extension:
                         set.Add("AdvertiseExecuteSequence/RegisterExtensionInfo");
                         set.Add("InstallExecuteSequence/RegisterExtensionInfo");
                         set.Add("InstallExecuteSequence/UnregisterExtensionInfo");
                         break;
-                    case TupleDefinitionType.File:
+                    case SymbolDefinitionType.File:
                         set.Add("InstallExecuteSequence/InstallFiles");
                         set.Add("InstallExecuteSequence/RemoveFiles");
 
                         var foundFont = false;
                         var foundSelfReg = false;
                         var foundBindPath = false;
-                        foreach (var file in this.Section.Tuples.OfType<FileTuple>())
+                        foreach (var file in this.Section.Symbols.OfType<FileSymbol>())
                         {
                             if (!foundFont && !String.IsNullOrEmpty(file.FontTitle))
                             {
@@ -469,83 +469,83 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                             }
                         }
                         break;
-                    case TupleDefinitionType.IniFile:
+                    case SymbolDefinitionType.IniFile:
                         set.Add("InstallExecuteSequence/WriteIniValues");
                         set.Add("InstallExecuteSequence/RemoveIniValues");
                         break;
-                    case TupleDefinitionType.IsolatedComponent:
+                    case SymbolDefinitionType.IsolatedComponent:
                         set.Add("InstallExecuteSequence/IsolateComponents");
                         break;
-                    case TupleDefinitionType.LaunchCondition:
+                    case SymbolDefinitionType.LaunchCondition:
                         set.Add("InstallExecuteSequence/LaunchConditions");
                         set.Add("InstallUISequence/LaunchConditions");
                         break;
-                    case TupleDefinitionType.MIME:
+                    case SymbolDefinitionType.MIME:
                         set.Add("AdvertiseExecuteSequence/RegisterMIMEInfo");
                         set.Add("InstallExecuteSequence/RegisterMIMEInfo");
                         set.Add("InstallExecuteSequence/UnregisterMIMEInfo");
                         break;
-                    case TupleDefinitionType.MoveFile:
+                    case SymbolDefinitionType.MoveFile:
                         set.Add("InstallExecuteSequence/MoveFiles");
                         break;
-                    case TupleDefinitionType.Assembly:
+                    case SymbolDefinitionType.Assembly:
                         set.Add("AdvertiseExecuteSequence/MsiPublishAssemblies");
                         set.Add("InstallExecuteSequence/MsiPublishAssemblies");
                         set.Add("InstallExecuteSequence/MsiUnpublishAssemblies");
                         break;
-                    case TupleDefinitionType.MsiServiceConfig:
-                    case TupleDefinitionType.MsiServiceConfigFailureActions:
+                    case SymbolDefinitionType.MsiServiceConfig:
+                    case SymbolDefinitionType.MsiServiceConfigFailureActions:
                         set.Add("InstallExecuteSequence/MsiConfigureServices");
                         break;
-                    case TupleDefinitionType.ODBCDataSource:
-                    case TupleDefinitionType.ODBCTranslator:
-                    case TupleDefinitionType.ODBCDriver:
+                    case SymbolDefinitionType.ODBCDataSource:
+                    case SymbolDefinitionType.ODBCTranslator:
+                    case SymbolDefinitionType.ODBCDriver:
                         set.Add("InstallExecuteSequence/SetODBCFolders");
                         set.Add("InstallExecuteSequence/InstallODBC");
                         set.Add("InstallExecuteSequence/RemoveODBC");
                         break;
-                    case TupleDefinitionType.ProgId:
+                    case SymbolDefinitionType.ProgId:
                         set.Add("AdvertiseExecuteSequence/RegisterProgIdInfo");
                         set.Add("InstallExecuteSequence/RegisterProgIdInfo");
                         set.Add("InstallExecuteSequence/UnregisterProgIdInfo");
                         break;
-                    case TupleDefinitionType.PublishComponent:
+                    case SymbolDefinitionType.PublishComponent:
                         set.Add("AdvertiseExecuteSequence/PublishComponents");
                         set.Add("InstallExecuteSequence/PublishComponents");
                         set.Add("InstallExecuteSequence/UnpublishComponents");
                         break;
-                    case TupleDefinitionType.Registry:
-                    case TupleDefinitionType.RemoveRegistry:
+                    case SymbolDefinitionType.Registry:
+                    case SymbolDefinitionType.RemoveRegistry:
                         set.Add("InstallExecuteSequence/WriteRegistryValues");
                         set.Add("InstallExecuteSequence/RemoveRegistryValues");
                         break;
-                    case TupleDefinitionType.RemoveFile:
+                    case SymbolDefinitionType.RemoveFile:
                         set.Add("InstallExecuteSequence/RemoveFiles");
                         break;
-                    case TupleDefinitionType.ServiceControl:
+                    case SymbolDefinitionType.ServiceControl:
                         set.Add("InstallExecuteSequence/StartServices");
                         set.Add("InstallExecuteSequence/StopServices");
                         set.Add("InstallExecuteSequence/DeleteServices");
                         break;
-                    case TupleDefinitionType.ServiceInstall:
+                    case SymbolDefinitionType.ServiceInstall:
                         set.Add("InstallExecuteSequence/InstallServices");
                         break;
-                    case TupleDefinitionType.Shortcut:
+                    case SymbolDefinitionType.Shortcut:
                         set.Add("AdvertiseExecuteSequence/CreateShortcuts");
                         set.Add("InstallExecuteSequence/CreateShortcuts");
                         set.Add("InstallExecuteSequence/RemoveShortcuts");
                         break;
-                    case TupleDefinitionType.TypeLib:
+                    case SymbolDefinitionType.TypeLib:
                         set.Add("InstallExecuteSequence/RegisterTypeLibraries");
                         set.Add("InstallExecuteSequence/UnregisterTypeLibraries");
                         break;
-                    case TupleDefinitionType.Upgrade:
+                    case SymbolDefinitionType.Upgrade:
                         set.Add("InstallExecuteSequence/FindRelatedProducts");
                         set.Add("InstallUISequence/FindRelatedProducts");
 
                         // Only add the MigrateFeatureStates action if MigrateFeature attribute is set on
                         // at least one UpgradeVersion element.
-                        if (this.Section.Tuples.OfType<UpgradeTuple>().Any(t => t.MigrateFeatures))
+                        if (this.Section.Symbols.OfType<UpgradeSymbol>().Any(t => t.MigrateFeatures))
                         {
                             set.Add("InstallExecuteSequence/MigrateFeatureStates");
                             set.Add("InstallUISequence/MigrateFeatureStates");
@@ -557,7 +557,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return set;
         }
 
-        private IEnumerable<WixActionTuple> GetActions(SequenceTable sequence, string[] actionNames)
+        private IEnumerable<WixActionSymbol> GetActions(SequenceTable sequence, string[] actionNames)
         {
             foreach (var action in WindowsInstallerStandard.StandardActions())
             {
@@ -571,64 +571,64 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// <summary>
         /// Sequence an action before or after a standard action.
         /// </summary>
-        /// <param name="actionTuple">The action tuple to be sequenced.</param>
-        /// <param name="requiredActionTuples">Collection of actions which must be included.</param>
-        private void SequenceActionTuple(WixActionTuple actionTuple, Dictionary<string, WixActionTuple> requiredActionTuples)
+        /// <param name="actionSymbol">The action symbol to be sequenced.</param>
+        /// <param name="requiredActionSymbols">Collection of actions which must be included.</param>
+        private void SequenceActionSymbol(WixActionSymbol actionSymbol, Dictionary<string, WixActionSymbol> requiredActionSymbols)
         {
             var after = false;
 
-            if (actionTuple.After != null)
+            if (actionSymbol.After != null)
             {
                 after = true;
             }
-            else if (actionTuple.Before == null)
+            else if (actionSymbol.Before == null)
             {
                 throw new InvalidOperationException("Found an action with no Sequence, Before, or After column set.");
             }
 
-            var parentActionName = (after ? actionTuple.After : actionTuple.Before);
-            var parentActionKey = actionTuple.SequenceTable.ToString() + "/" + parentActionName;
+            var parentActionName = (after ? actionSymbol.After : actionSymbol.Before);
+            var parentActionKey = actionSymbol.SequenceTable.ToString() + "/" + parentActionName;
 
-            if (!requiredActionTuples.TryGetValue(parentActionKey, out var parentActionTuple))
+            if (!requiredActionSymbols.TryGetValue(parentActionKey, out var parentActionSymbol))
             {
                 // If the missing parent action is a standard action (with a suggested sequence number), add it.
-                if (WindowsInstallerStandard.TryGetStandardAction(parentActionKey, out parentActionTuple))
+                if (WindowsInstallerStandard.TryGetStandardAction(parentActionKey, out parentActionSymbol))
                 {
                     // Create a clone to avoid modifying the static copy of the object.
-                    // TODO: consider this: parentActionTuple = parentActionTuple.Clone();
+                    // TODO: consider this: parentActionSymbol = parentActionSymbol.Clone();
 
-                    requiredActionTuples.Add(parentActionTuple.Id.Id, parentActionTuple);
+                    requiredActionSymbols.Add(parentActionSymbol.Id.Id, parentActionSymbol);
                 }
                 else
                 {
                     throw new InvalidOperationException(String.Format(CultureInfo.CurrentUICulture, "Found an action with a non-existent {0} action: {1}.", (after ? "After" : "Before"), parentActionName));
                 }
             }
-            else if (actionTuple == parentActionTuple || this.ContainsChildActionTuple(actionTuple, parentActionTuple)) // cycle detected
+            else if (actionSymbol == parentActionSymbol || this.ContainsChildActionSymbol(actionSymbol, parentActionSymbol)) // cycle detected
             {
-                throw new WixException(ErrorMessages.ActionCircularDependency(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action, parentActionTuple.Action));
+                throw new WixException(ErrorMessages.ActionCircularDependency(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action, parentActionSymbol.Action));
             }
 
-            // Add this action to the appropriate list of dependent action tuples.
-            var relativeActions = this.GetRelativeActions(parentActionTuple);
-            var relatedTuples = (after ? relativeActions.NextActions : relativeActions.PreviousActions);
-            relatedTuples.Add(actionTuple);
+            // Add this action to the appropriate list of dependent action symbols.
+            var relativeActions = this.GetRelativeActions(parentActionSymbol);
+            var relatedSymbols = (after ? relativeActions.NextActions : relativeActions.PreviousActions);
+            relatedSymbols.Add(actionSymbol);
         }
 
-        private bool ContainsChildActionTuple(WixActionTuple childTuple, WixActionTuple parentTuple)
+        private bool ContainsChildActionSymbol(WixActionSymbol childSymbol, WixActionSymbol parentSymbol)
         {
             var result = false;
 
-            if (this.RelativeActionsForActions.TryGetValue(childTuple.Id.Id, out var relativeActions))
+            if (this.RelativeActionsForActions.TryGetValue(childSymbol.Id.Id, out var relativeActions))
             {
-                result = relativeActions.NextActions.Any(a => a.SequenceTable == parentTuple.SequenceTable && a.Id.Id == parentTuple.Id.Id) ||
-                     relativeActions.PreviousActions.Any(a => a.SequenceTable == parentTuple.SequenceTable && a.Id.Id == parentTuple.Id.Id);
+                result = relativeActions.NextActions.Any(a => a.SequenceTable == parentSymbol.SequenceTable && a.Id.Id == parentSymbol.Id.Id) ||
+                     relativeActions.PreviousActions.Any(a => a.SequenceTable == parentSymbol.SequenceTable && a.Id.Id == parentSymbol.Id.Id);
             }
 
             return result;
         }
 
-        private RelativeActions GetRelativeActions(WixActionTuple action)
+        private RelativeActions GetRelativeActions(WixActionSymbol action)
         {
             if (!this.RelativeActionsForActions.TryGetValue(action.Id.Id, out var relativeActions))
             {
@@ -639,7 +639,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return relativeActions;
         }
 
-        private RelativeActions GetAllRelativeActionsForSequenceType(SequenceTable sequenceType, WixActionTuple action)
+        private RelativeActions GetAllRelativeActionsForSequenceType(SequenceTable sequenceType, WixActionSymbol action)
         {
             var relativeActions = new RelativeActions();
 
@@ -653,7 +653,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             return relativeActions;
         }
 
-        private void RecurseRelativeActionsForSequenceType(SequenceTable sequenceType, List<WixActionTuple> actions, List<WixActionTuple> visitedActions)
+        private void RecurseRelativeActionsForSequenceType(SequenceTable sequenceType, List<WixActionSymbol> actions, List<WixActionSymbol> visitedActions)
         {
             foreach (var action in actions.Where(a => a.SequenceTable == sequenceType))
             {
@@ -673,9 +673,9 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         private class RelativeActions
         {
-            public List<WixActionTuple> PreviousActions { get; } = new List<WixActionTuple>();
+            public List<WixActionSymbol> PreviousActions { get; } = new List<WixActionSymbol>();
 
-            public List<WixActionTuple> NextActions { get; } = new List<WixActionTuple>();
+            public List<WixActionSymbol> NextActions { get; } = new List<WixActionSymbol>();
         }
     }
 }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFileFacadesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFileFacadesCommand.cs
index 75bcfe17..938627ed 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFileFacadesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFileFacadesCommand.cs
@@ -11,7 +11,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using WixToolset.Core.Bind;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Extensibility.Services;
 
     /// <summary>
@@ -43,15 +43,15 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            var assemblyNameTuples = this.Section.Tuples.OfType<MsiAssemblyNameTuple>().ToDictionary(t => t.Id.Id);
+            var assemblyNameSymbols = this.Section.Symbols.OfType<MsiAssemblyNameSymbol>().ToDictionary(t => t.Id.Id);
 
             foreach (var file in this.UpdateFileFacades)
             {
-                this.UpdateFileFacade(file, assemblyNameTuples);
+                this.UpdateFileFacade(file, assemblyNameSymbols);
             }
         }
 
-        private void UpdateFileFacade(FileFacade facade, Dictionary<string, MsiAssemblyNameTuple> assemblyNameTuples)
+        private void UpdateFileFacade(FileFacade facade, Dictionary<string, MsiAssemblyNameSymbol> assemblyNameSymbols)
         {
             FileInfo fileInfo = null;
             try
@@ -155,7 +155,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
                     if (null == facade.Hash)
                     {
-                        facade.Hash = this.Section.AddTuple(new MsiFileHashTuple(facade.SourceLineNumber, facade.Identifier));
+                        facade.Hash = this.Section.AddSymbol(new MsiFileHashSymbol(facade.SourceLineNumber, facade.Identifier));
                     }
 
                     facade.Hash.Options = 0;
@@ -220,23 +220,23 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 {
                     var assemblyName = AssemblyNameReader.ReadAssembly(facade.SourceLineNumber, fileInfo.FullName, version);
 
-                    this.SetMsiAssemblyName(assemblyNameTuples, facade, "name", assemblyName.Name);
-                    this.SetMsiAssemblyName(assemblyNameTuples, facade, "culture", assemblyName.Culture);
-                    this.SetMsiAssemblyName(assemblyNameTuples, facade, "version", assemblyName.Version);
+                    this.SetMsiAssemblyName(assemblyNameSymbols, facade, "name", assemblyName.Name);
+                    this.SetMsiAssemblyName(assemblyNameSymbols, facade, "culture", assemblyName.Culture);
+                    this.SetMsiAssemblyName(assemblyNameSymbols, facade, "version", assemblyName.Version);
 
                     if (!String.IsNullOrEmpty(assemblyName.Architecture))
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "processorArchitecture", assemblyName.Architecture);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "processorArchitecture", assemblyName.Architecture);
                     }
                     // TODO: WiX v3 seemed to do this but not clear it should actually be done.
                     //else if (!String.IsNullOrEmpty(file.WixFile.ProcessorArchitecture))
                     //{
-                    //    this.SetMsiAssemblyName(assemblyNameTuples, file, "processorArchitecture", file.WixFile.ProcessorArchitecture);
+                    //    this.SetMsiAssemblyName(assemblyNameSymbols, file, "processorArchitecture", file.WixFile.ProcessorArchitecture);
                     //}
 
                     if (assemblyName.StrongNamedSigned)
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "publicKeyToken", assemblyName.PublicKeyToken);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "publicKeyToken", assemblyName.PublicKeyToken);
                     }
                     else if (facade.AssemblyApplicationFileRef == null)
                     {
@@ -245,7 +245,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
                     if (!String.IsNullOrEmpty(assemblyName.FileVersion))
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "fileVersion", assemblyName.FileVersion);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "fileVersion", assemblyName.FileVersion);
                     }
 
                     // add the assembly name to the information cache
@@ -276,27 +276,27 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
                     if (!String.IsNullOrEmpty(assemblyName.Name))
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "name", assemblyName.Name);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "name", assemblyName.Name);
                     }
 
                     if (!String.IsNullOrEmpty(assemblyName.Version))
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "version", assemblyName.Version);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "version", assemblyName.Version);
                     }
 
                     if (!String.IsNullOrEmpty(assemblyName.Type))
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "type", assemblyName.Type);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "type", assemblyName.Type);
                     }
 
                     if (!String.IsNullOrEmpty(assemblyName.Architecture))
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "processorArchitecture", assemblyName.Architecture);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "processorArchitecture", assemblyName.Architecture);
                     }
 
                     if (!String.IsNullOrEmpty(assemblyName.PublicKeyToken))
                     {
-                        this.SetMsiAssemblyName(assemblyNameTuples, facade, "publicKeyToken", assemblyName.PublicKeyToken);
+                        this.SetMsiAssemblyName(assemblyNameSymbols, facade, "publicKeyToken", assemblyName.PublicKeyToken);
                     }
                 }
                 catch (WixException e)
@@ -310,11 +310,11 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         /// Set an MsiAssemblyName row.  If it was directly authored, override the value, otherwise
         /// create a new row.
         /// </summary>
-        /// <param name="assemblyNameTuples">MsiAssemblyName table.</param>
+        /// <param name="assemblyNameSymbols">MsiAssemblyName table.</param>
         /// <param name="facade">FileFacade containing the assembly read for the MsiAssemblyName row.</param>
         /// <param name="name">MsiAssemblyName name.</param>
         /// <param name="value">MsiAssemblyName value.</param>
-        private void SetMsiAssemblyName(Dictionary<string, MsiAssemblyNameTuple> assemblyNameTuples, FileFacade facade, string name, string value)
+        private void SetMsiAssemblyName(Dictionary<string, MsiAssemblyNameSymbol> assemblyNameSymbols, FileFacade facade, string name, string value)
         {
             // check for null value (this can occur when grabbing the file version from an assembly without one)
             if (String.IsNullOrEmpty(value))
@@ -333,9 +333,9 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
                 // override directly authored value
                 var lookup = String.Concat(facade.ComponentRef, "/", name);
-                if (!assemblyNameTuples.TryGetValue(lookup, out var assemblyNameTuple))
+                if (!assemblyNameSymbols.TryGetValue(lookup, out var assemblyNameSymbol))
                 {
-                    assemblyNameTuple = this.Section.AddTuple(new MsiAssemblyNameTuple(facade.SourceLineNumber, new Identifier(AccessModifier.Private, facade.ComponentRef, name))
+                    assemblyNameSymbol = this.Section.AddSymbol(new MsiAssemblyNameSymbol(facade.SourceLineNumber, new Identifier(AccessModifier.Private, facade.ComponentRef, name))
                     {
                         ComponentRef = facade.ComponentRef,
                         Name = name,
@@ -344,15 +344,15 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
                     if (null == facade.AssemblyNames)
                     {
-                        facade.AssemblyNames = new List<MsiAssemblyNameTuple>();
+                        facade.AssemblyNames = new List<MsiAssemblyNameSymbol>();
                     }
 
-                    facade.AssemblyNames.Add(assemblyNameTuple);
+                    facade.AssemblyNames.Add(assemblyNameSymbol);
 
-                    assemblyNameTuples.Add(assemblyNameTuple.Id.Id, assemblyNameTuple);
+                    assemblyNameSymbols.Add(assemblyNameSymbol.Id.Id, assemblyNameSymbol);
                 }
 
-                assemblyNameTuple.Value = value;
+                assemblyNameSymbol.Value = value;
 
                 if (this.VariableCache != null)
                 {
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFromTextFilesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFromTextFilesCommand.cs
index 4d09ff6b..66a648cc 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFromTextFilesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateFromTextFilesCommand.cs
@@ -6,7 +6,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.IO;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Extensibility.Services;
 
     internal class UpdateFromTextFilesCommand
@@ -23,17 +23,17 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            foreach (var bbControl in this.Section.Tuples.OfType<BBControlTuple>().Where(t => t.SourceFile != null))
+            foreach (var bbControl in this.Section.Symbols.OfType<BBControlSymbol>().Where(t => t.SourceFile != null))
             {
                 bbControl.Text = this.ReadTextFile(bbControl.SourceLineNumbers, bbControl.SourceFile.Path);
             }
 
-            foreach (var control in this.Section.Tuples.OfType<ControlTuple>().Where(t => t.SourceFile != null))
+            foreach (var control in this.Section.Symbols.OfType<ControlSymbol>().Where(t => t.SourceFile != null))
             {
                 control.Text = this.ReadTextFile(control.SourceLineNumbers, control.SourceFile.Path);
             }
 
-            foreach (var customAction in this.Section.Tuples.OfType<CustomActionTuple>().Where(c => c.ScriptFile != null))
+            foreach (var customAction in this.Section.Symbols.OfType<CustomActionSymbol>().Where(c => c.ScriptFile != null))
             {
                 customAction.Target = this.ReadTextFile(customAction.SourceLineNumbers, customAction.ScriptFile.Path);
             }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateMediaSequencesCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateMediaSequencesCommand.cs
index bf28b279..d3f2b9ea 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateMediaSequencesCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateMediaSequencesCommand.cs
@@ -6,7 +6,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Linq;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
 
     internal class UpdateMediaSequencesCommand
     {
@@ -22,7 +22,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
 
         public void Execute()
         {
-            var mediaRows = this.Section.Tuples.OfType<MediaTuple>().ToDictionary(t => t.DiskId);
+            var mediaRows = this.Section.Symbols.OfType<MediaSymbol>().ToDictionary(t => t.DiskId);
 
             // Calculate sequence numbers and media disk id layout for all file media information objects.
             if (SectionType.Module == this.Section.Type)
@@ -37,25 +37,25 @@ namespace WixToolset.Core.WindowsInstaller.Bind
             else
             {
                 var lastSequence = 0;
-                MediaTuple mediaTuple = null;
+                MediaSymbol mediaSymbol = null;
                 var patchGroups = new Dictionary<int, List<FileFacade>>();
 
                 // sequence the non-patch-added files
                 foreach (var facade in this.FileFacades)
                 {
-                    if (null == mediaTuple)
+                    if (null == mediaSymbol)
                     {
-                        mediaTuple = mediaRows[facade.DiskId];
+                        mediaSymbol = mediaRows[facade.DiskId];
                         if (SectionType.Patch == this.Section.Type)
                         {
                             // patch Media cannot start at zero
-                            lastSequence = mediaTuple.LastSequence ?? 1;
+                            lastSequence = mediaSymbol.LastSequence ?? 1;
                         }
                     }
-                    else if (mediaTuple.DiskId != facade.DiskId)
+                    else if (mediaSymbol.DiskId != facade.DiskId)
                     {
-                        mediaTuple.LastSequence = lastSequence;
-                        mediaTuple = mediaRows[facade.DiskId];
+                        mediaSymbol.LastSequence = lastSequence;
+                        mediaSymbol = mediaRows[facade.DiskId];
                     }
 
                     if (facade.PatchGroup.HasValue)
@@ -74,10 +74,10 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     }
                 }
 
-                if (null != mediaTuple)
+                if (null != mediaSymbol)
                 {
-                    mediaTuple.LastSequence = lastSequence;
-                    mediaTuple = null;
+                    mediaSymbol.LastSequence = lastSequence;
+                    mediaSymbol = null;
                 }
 
                 // sequence the patch-added files
@@ -85,23 +85,23 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 {
                     foreach (var facade in patchGroup)
                     {
-                        if (null == mediaTuple)
+                        if (null == mediaSymbol)
                         {
-                            mediaTuple = mediaRows[facade.DiskId];
+                            mediaSymbol = mediaRows[facade.DiskId];
                         }
-                        else if (mediaTuple.DiskId != facade.DiskId)
+                        else if (mediaSymbol.DiskId != facade.DiskId)
                         {
-                            mediaTuple.LastSequence = lastSequence;
-                            mediaTuple = mediaRows[facade.DiskId];
+                            mediaSymbol.LastSequence = lastSequence;
+                            mediaSymbol = mediaRows[facade.DiskId];
                         }
 
                         facade.Sequence = ++lastSequence;
                     }
                 }
 
-                if (null != mediaTuple)
+                if (null != mediaSymbol)
                 {
-                    mediaTuple.LastSequence = lastSequence;
+                    mediaSymbol.LastSequence = lastSequence;
                 }
             }
         }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateTransformsWithFileFacades.cs b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateTransformsWithFileFacades.cs
index 2af45e77..944fb224 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/UpdateTransformsWithFileFacades.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/UpdateTransformsWithFileFacades.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Linq;
     using WixToolset.Core.Bind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility.Services;
@@ -307,9 +307,9 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     ref duplicateFilesSequence);
             if (!hasPatchFilesAction)
             {
-                WindowsInstallerStandard.TryGetStandardAction(tableName, "PatchFiles", out var patchFilesActionTuple);
+                WindowsInstallerStandard.TryGetStandardAction(tableName, "PatchFiles", out var patchFilesActionSymbol);
 
-                var sequence = patchFilesActionTuple.Sequence;
+                var sequence = patchFilesActionSymbol.Sequence;
 
                 // Test for default sequence value's appropriateness
                 if (installFilesSequence >= sequence || (0 != duplicateFilesSequence && duplicateFilesSequence <= sequence))
@@ -318,14 +318,14 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                     {
                         if (duplicateFilesSequence < installFilesSequence)
                         {
-                            throw new WixException(ErrorMessages.InsertInvalidSequenceActionOrder(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionTuple.Action));
+                            throw new WixException(ErrorMessages.InsertInvalidSequenceActionOrder(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionSymbol.Action));
                         }
                         else
                         {
                             sequence = (duplicateFilesSequence + installFilesSequence) / 2;
                             if (installFilesSequence == sequence || duplicateFilesSequence == sequence)
                             {
-                                throw new WixException(ErrorMessages.InsertSequenceNoSpace(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionTuple.Action));
+                                throw new WixException(ErrorMessages.InsertSequenceNoSpace(mainFileRow.SourceLineNumbers, tableName, "InstallFiles", "DuplicateFiles", patchFilesActionSymbol.Action));
                             }
                         }
                     }
@@ -342,8 +342,8 @@ namespace WixToolset.Core.WindowsInstaller.Bind
                 }
 
                 var patchAction = sequenceTable.CreateRow(null);
-                patchAction[0] = patchFilesActionTuple.Action;
-                patchAction[1] = patchFilesActionTuple.Condition;
+                patchAction[0] = patchFilesActionSymbol.Action;
+                patchAction[1] = patchFilesActionSymbol.Condition;
                 patchAction[2] = sequence;
                 patchAction.Operation = RowOperation.Add;
             }
diff --git a/src/WixToolset.Core.WindowsInstaller/Bind/ValidateComponentGuidsCommand.cs b/src/WixToolset.Core.WindowsInstaller/Bind/ValidateComponentGuidsCommand.cs
index 020a83fc..5cad9247 100644
--- a/src/WixToolset.Core.WindowsInstaller/Bind/ValidateComponentGuidsCommand.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Bind/ValidateComponentGuidsCommand.cs
@@ -6,7 +6,7 @@ namespace WixToolset.Core.WindowsInstaller.Bind
     using System.Collections.Generic;
     using System.Linq;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Extensibility.Services;
 
     /// <summary>
@@ -32,30 +32,30 @@ namespace WixToolset.Core.WindowsInstaller.Bind
         {
             var componentGuidConditions = new Dictionary<string, bool>();
 
-            foreach (var componentTuple in this.Section.Tuples.OfType<ComponentTuple>())
+            foreach (var componentSymbol in this.Section.Symbols.OfType<ComponentSymbol>())
             {
                 // We don't care about unmanaged components and if there's a * GUID remaining,
                 // there's already an error that prevented it from being replaced with a real GUID.
-                if (!String.IsNullOrEmpty(componentTuple.ComponentId) && "*" != componentTuple.ComponentId)
+                if (!String.IsNullOrEmpty(componentSymbol.ComponentId) && "*" != componentSymbol.ComponentId)
                 {
-                    var thisComponentHasCondition = !String.IsNullOrEmpty(componentTuple.Condition);
+                    var thisComponentHasCondition = !String.IsNullOrEmpty(componentSymbol.Condition);
                     var allComponentsHaveConditions = thisComponentHasCondition;
 
-                    if (componentGuidConditions.TryGetValue(componentTuple.ComponentId, out var alreadyCheckedCondition))
+                    if (componentGuidConditions.TryGetValue(componentSymbol.ComponentId, out var alreadyCheckedCondition))
                     {
                         allComponentsHaveConditions = thisComponentHasCondition && alreadyCheckedCondition;
 
                         if (allComponentsHaveConditions)
                         {
-                            this.Messaging.Write(WarningMessages.DuplicateComponentGuidsMustHaveMutuallyExclusiveConditions(componentTuple.SourceLineNumbers, componentTuple.Id.Id, componentTuple.ComponentId));
+                            this.Messaging.Write(WarningMessages.DuplicateComponentGuidsMustHaveMutuallyExclusiveConditions(componentSymbol.SourceLineNumbers, componentSymbol.Id.Id, componentSymbol.ComponentId));
                         }
                         else
                         {
-                            this.Messaging.Write(ErrorMessages.DuplicateComponentGuids(componentTuple.SourceLineNumbers, componentTuple.Id.Id, componentTuple.ComponentId));
+                            this.Messaging.Write(ErrorMessages.DuplicateComponentGuids(componentSymbol.SourceLineNumbers, componentSymbol.Id.Id, componentSymbol.ComponentId));
                         }
                     }
 
-                    componentGuidConditions[componentTuple.ComponentId] = allComponentsHaveConditions;
+                    componentGuidConditions[componentSymbol.ComponentId] = allComponentsHaveConditions;
                 }
             }
         }
diff --git a/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs b/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
index 7c3fd6be..72985c1c 100644
--- a/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
@@ -14,7 +14,7 @@ namespace WixToolset.Core.WindowsInstaller
     using System.Xml.Linq;
     using WixToolset.Core;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility;
@@ -92,7 +92,7 @@ namespace WixToolset.Core.WindowsInstaller
 
         private OutputType OutputType { get; set; }
 
-        private Dictionary<string, WixActionTuple> StandardActions { get; }
+        private Dictionary<string, WixActionSymbol> StandardActions { get; }
 
         /// <summary>
         /// Decompile the database file.
@@ -262,23 +262,23 @@ namespace WixToolset.Core.WindowsInstaller
         /// <summary>
         /// Creates an action element.
         /// </summary>
-        /// <param name="actionTuple">The action from which the element should be created.</param>
-        private void CreateActionElement(WixActionTuple actionTuple)
+        /// <param name="actionSymbol">The action from which the element should be created.</param>
+        private void CreateActionElement(WixActionSymbol actionSymbol)
         {
             Wix.ISchemaElement actionElement = null;
 
-            if (null != this.core.GetIndexedElement("CustomAction", actionTuple.Action)) // custom action
+            if (null != this.core.GetIndexedElement("CustomAction", actionSymbol.Action)) // custom action
             {
                 var custom = new Wix.Custom();
 
-                custom.Action = actionTuple.Action;
+                custom.Action = actionSymbol.Action;
 
-                if (null != actionTuple.Condition)
+                if (null != actionSymbol.Condition)
                 {
-                    custom.Content = actionTuple.Condition;
+                    custom.Content = actionSymbol.Condition;
                 }
 
-                switch (actionTuple.Sequence)
+                switch (actionSymbol.Sequence)
                 {
                 case (-4):
                     custom.OnExit = Wix.ExitType.suspend;
@@ -293,35 +293,35 @@ namespace WixToolset.Core.WindowsInstaller
                     custom.OnExit = Wix.ExitType.success;
                     break;
                 default:
-                    if (null != actionTuple.Before)
+                    if (null != actionSymbol.Before)
                     {
-                        custom.Before = actionTuple.Before;
+                        custom.Before = actionSymbol.Before;
                     }
-                    else if (null != actionTuple.After)
+                    else if (null != actionSymbol.After)
                     {
-                        custom.After = actionTuple.After;
+                        custom.After = actionSymbol.After;
                     }
-                    else if (actionTuple.Sequence.HasValue)
+                    else if (actionSymbol.Sequence.HasValue)
                     {
-                        custom.Sequence = actionTuple.Sequence.Value;
+                        custom.Sequence = actionSymbol.Sequence.Value;
                     }
                     break;
                 }
 
                 actionElement = custom;
             }
-            else if (null != this.core.GetIndexedElement("Dialog", actionTuple.Action)) // dialog
+            else if (null != this.core.GetIndexedElement("Dialog", actionSymbol.Action)) // dialog
             {
                 var show = new Wix.Show();
 
-                show.Dialog = actionTuple.Action;
+                show.Dialog = actionSymbol.Action;
 
-                if (null != actionTuple.Condition)
+                if (null != actionSymbol.Condition)
                 {
-                    show.Content = actionTuple.Condition;
+                    show.Content = actionSymbol.Condition;
                 }
 
-                switch (actionTuple.Sequence)
+                switch (actionSymbol.Sequence)
                 {
                 case (-4):
                     show.OnExit = Wix.ExitType.suspend;
@@ -336,17 +336,17 @@ namespace WixToolset.Core.WindowsInstaller
                     show.OnExit = Wix.ExitType.success;
                     break;
                 default:
-                    if (null != actionTuple.Before)
+                    if (null != actionSymbol.Before)
                     {
-                        show.Before = actionTuple.Before;
+                        show.Before = actionSymbol.Before;
                     }
-                    else if (null != actionTuple.After)
+                    else if (null != actionSymbol.After)
                     {
-                        show.After = actionTuple.After;
+                        show.After = actionSymbol.After;
                     }
-                    else if (actionTuple.Sequence.HasValue)
+                    else if (actionSymbol.Sequence.HasValue)
                     {
-                        show.Sequence = actionTuple.Sequence.Value;
+                        show.Sequence = actionSymbol.Sequence.Value;
                     }
                     break;
                 }
@@ -355,18 +355,18 @@ namespace WixToolset.Core.WindowsInstaller
             }
             else // possibly a standard action without suggested sequence information
             {
-                actionElement = this.CreateStandardActionElement(actionTuple);
+                actionElement = this.CreateStandardActionElement(actionSymbol);
             }
 
             // add the action element to the appropriate sequence element
             if (null != actionElement)
             {
-                var sequenceTable = actionTuple.SequenceTable.ToString();
+                var sequenceTable = actionSymbol.SequenceTable.ToString();
                 var sequenceElement = (Wix.IParentElement)this.sequenceElements[sequenceTable];
 
                 if (null == sequenceElement)
                 {
-                    switch (actionTuple.SequenceTable)
+                    switch (actionSymbol.SequenceTable)
                     {
                     case SequenceTable.AdminExecuteSequence:
                         sequenceElement = new Wix.AdminExecuteSequence();
@@ -397,7 +397,7 @@ namespace WixToolset.Core.WindowsInstaller
                 }
                 catch (System.ArgumentException) // action/dialog is not valid for this sequence
                 {
-                    this.Messaging.Write(WarningMessages.IllegalActionInSequence(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action));
+                    this.Messaging.Write(WarningMessages.IllegalActionInSequence(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action));
                 }
             }
         }
@@ -405,40 +405,40 @@ namespace WixToolset.Core.WindowsInstaller
         /// <summary>
         /// Creates a standard action element.
         /// </summary>
-        /// <param name="actionTuple">The action row from which the element should be created.</param>
+        /// <param name="actionSymbol">The action row from which the element should be created.</param>
         /// <returns>The created element.</returns>
-        private Wix.ISchemaElement CreateStandardActionElement(WixActionTuple actionTuple)
+        private Wix.ISchemaElement CreateStandardActionElement(WixActionSymbol actionSymbol)
         {
             Wix.ActionSequenceType actionElement = null;
 
-            switch (actionTuple.Action)
+            switch (actionSymbol.Action)
             {
             case "AllocateRegistrySpace":
                 actionElement = new Wix.AllocateRegistrySpace();
                 break;
             case "AppSearch":
-                this.StandardActions.TryGetValue(actionTuple.Id.Id, out var appSearchActionRow);
+                this.StandardActions.TryGetValue(actionSymbol.Id.Id, out var appSearchActionRow);
 
-                if (null != actionTuple.Before || null != actionTuple.After || (null != appSearchActionRow && actionTuple.Sequence != appSearchActionRow.Sequence))
+                if (null != actionSymbol.Before || null != actionSymbol.After || (null != appSearchActionRow && actionSymbol.Sequence != appSearchActionRow.Sequence))
                 {
                     var appSearch = new Wix.AppSearch();
 
-                    if (null != actionTuple.Condition)
+                    if (null != actionSymbol.Condition)
                     {
-                        appSearch.Content = actionTuple.Condition;
+                        appSearch.Content = actionSymbol.Condition;
                     }
 
-                    if (null != actionTuple.Before)
+                    if (null != actionSymbol.Before)
                     {
-                        appSearch.Before = actionTuple.Before;
+                        appSearch.Before = actionSymbol.Before;
                     }
-                    else if (null != actionTuple.After)
+                    else if (null != actionSymbol.After)
                     {
-                        appSearch.After = actionTuple.After;
+                        appSearch.After = actionSymbol.After;
                     }
-                    else if (actionTuple.Sequence.HasValue)
+                    else if (actionSymbol.Sequence.HasValue)
                     {
-                        appSearch.Sequence = actionTuple.Sequence.Value;
+                        appSearch.Sequence = actionSymbol.Sequence.Value;
                     }
 
                     return appSearch;
@@ -449,7 +449,7 @@ namespace WixToolset.Core.WindowsInstaller
                 break;
             case "CCPSearch":
                 var ccpSearch = new Wix.CCPSearch();
-                Decompiler.SequenceRelativeAction(actionTuple, ccpSearch);
+                Decompiler.SequenceRelativeAction(actionSymbol, ccpSearch);
                 return ccpSearch;
             case "CostFinalize":
                 actionElement = new Wix.CostFinalize();
@@ -468,7 +468,7 @@ namespace WixToolset.Core.WindowsInstaller
                 break;
             case "DisableRollback":
                 var disableRollback = new Wix.DisableRollback();
-                Decompiler.SequenceRelativeAction(actionTuple, disableRollback);
+                Decompiler.SequenceRelativeAction(actionSymbol, disableRollback);
                 return disableRollback;
             case "DuplicateFiles":
                 actionElement = new Wix.DuplicateFiles();
@@ -481,22 +481,22 @@ namespace WixToolset.Core.WindowsInstaller
                 break;
             case "FindRelatedProducts":
                 var findRelatedProducts = new Wix.FindRelatedProducts();
-                Decompiler.SequenceRelativeAction(actionTuple, findRelatedProducts);
+                Decompiler.SequenceRelativeAction(actionSymbol, findRelatedProducts);
                 return findRelatedProducts;
             case "ForceReboot":
                 var forceReboot = new Wix.ForceReboot();
-                Decompiler.SequenceRelativeAction(actionTuple, forceReboot);
+                Decompiler.SequenceRelativeAction(actionSymbol, forceReboot);
                 return forceReboot;
             case "InstallAdminPackage":
                 actionElement = new Wix.InstallAdminPackage();
                 break;
             case "InstallExecute":
                 var installExecute = new Wix.InstallExecute();
-                Decompiler.SequenceRelativeAction(actionTuple, installExecute);
+                Decompiler.SequenceRelativeAction(actionSymbol, installExecute);
                 return installExecute;
             case "InstallExecuteAgain":
                 var installExecuteAgain = new Wix.InstallExecuteAgain();
-                Decompiler.SequenceRelativeAction(actionTuple, installExecuteAgain);
+                Decompiler.SequenceRelativeAction(actionSymbol, installExecuteAgain);
                 return installExecuteAgain;
             case "InstallFiles":
                 actionElement = new Wix.InstallFiles();
@@ -521,7 +521,7 @@ namespace WixToolset.Core.WindowsInstaller
                 break;
             case "LaunchConditions":
                 var launchConditions = new Wix.LaunchConditions();
-                Decompiler.SequenceRelativeAction(actionTuple, launchConditions);
+                Decompiler.SequenceRelativeAction(actionSymbol, launchConditions);
                 return launchConditions;
             case "MigrateFeatureStates":
                 actionElement = new Wix.MigrateFeatureStates();
@@ -585,7 +585,7 @@ namespace WixToolset.Core.WindowsInstaller
                 break;
             case "RemoveExistingProducts":
                 var removeExistingProducts = new Wix.RemoveExistingProducts();
-                Decompiler.SequenceRelativeAction(actionTuple, removeExistingProducts);
+                Decompiler.SequenceRelativeAction(actionSymbol, removeExistingProducts);
                 return removeExistingProducts;
             case "RemoveFiles":
                 actionElement = new Wix.RemoveFiles();
@@ -607,15 +607,15 @@ namespace WixToolset.Core.WindowsInstaller
                 break;
             case "ResolveSource":
                 var resolveSource = new Wix.ResolveSource();
-                Decompiler.SequenceRelativeAction(actionTuple, resolveSource);
+                Decompiler.SequenceRelativeAction(actionSymbol, resolveSource);
                 return resolveSource;
             case "RMCCPSearch":
                 var rmccpSearch = new Wix.RMCCPSearch();
-                Decompiler.SequenceRelativeAction(actionTuple, rmccpSearch);
+                Decompiler.SequenceRelativeAction(actionSymbol, rmccpSearch);
                 return rmccpSearch;
             case "ScheduleReboot":
                 var scheduleReboot = new Wix.ScheduleReboot();
-                Decompiler.SequenceRelativeAction(actionTuple, scheduleReboot);
+                Decompiler.SequenceRelativeAction(actionSymbol, scheduleReboot);
                 return scheduleReboot;
             case "SelfRegModules":
                 actionElement = new Wix.SelfRegModules();
@@ -672,13 +672,13 @@ namespace WixToolset.Core.WindowsInstaller
                 actionElement = new Wix.WriteRegistryValues();
                 break;
             default:
-                this.Messaging.Write(WarningMessages.UnknownAction(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action));
+                this.Messaging.Write(WarningMessages.UnknownAction(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action));
                 return null;
             }
 
             if (actionElement != null)
             {
-                this.SequenceStandardAction(actionTuple, actionElement);
+                this.SequenceStandardAction(actionSymbol, actionElement);
             }
 
             return actionElement;
@@ -687,48 +687,48 @@ namespace WixToolset.Core.WindowsInstaller
         /// <summary>
         /// Applies the condition and sequence to a standard action element based on the action row data.
         /// </summary>
-        /// <param name="actionTuple">Action data from the database.</param>
+        /// <param name="actionSymbol">Action data from the database.</param>
         /// <param name="actionElement">Element to be sequenced.</param>
-        private void SequenceStandardAction(WixActionTuple actionTuple, Wix.ActionSequenceType actionElement)
+        private void SequenceStandardAction(WixActionSymbol actionSymbol, Wix.ActionSequenceType actionElement)
         {
-            if (null != actionTuple.Condition)
+            if (null != actionSymbol.Condition)
             {
-                actionElement.Content = actionTuple.Condition;
+                actionElement.Content = actionSymbol.Condition;
             }
 
-            if ((null != actionTuple.Before || null != actionTuple.After) && 0 == actionTuple.Sequence)
+            if ((null != actionSymbol.Before || null != actionSymbol.After) && 0 == actionSymbol.Sequence)
             {
-                this.Messaging.Write(WarningMessages.DecompiledStandardActionRelativelyScheduledInModule(actionTuple.SourceLineNumbers, actionTuple.SequenceTable.ToString(), actionTuple.Action));
+                this.Messaging.Write(WarningMessages.DecompiledStandardActionRelativelyScheduledInModule(actionSymbol.SourceLineNumbers, actionSymbol.SequenceTable.ToString(), actionSymbol.Action));
             }
-            else if (actionTuple.Sequence.HasValue)
+            else if (actionSymbol.Sequence.HasValue)
             {
-                actionElement.Sequence = actionTuple.Sequence.Value;
+                actionElement.Sequence = actionSymbol.Sequence.Value;
             }
         }
 
         /// <summary>
         /// Applies the condition and relative sequence to an action element based on the action row data.
         /// </summary>
-        /// <param name="actionTuple">Action data from the database.</param>
+        /// <param name="actionSymbol">Action data from the database.</param>
         /// <param name="actionElement">Element to be sequenced.</param>
-        private static void SequenceRelativeAction(WixActionTuple actionTuple, Wix.ActionModuleSequenceType actionElement)
+        private static void SequenceRelativeAction(WixActionSymbol actionSymbol, Wix.ActionModuleSequenceType actionElement)
         {
-            if (null != actionTuple.Condition)
+            if (null != actionSymbol.Condition)
             {
-                actionElement.Content = actionTuple.Condition;
+                actionElement.Content = actionSymbol.Condition;
             }
 
-            if (null != actionTuple.Before)
+            if (null != actionSymbol.Before)
             {
-                actionElement.Before = actionTuple.Before;
+                actionElement.Before = actionSymbol.Before;
             }
-            else if (null != actionTuple.After)
+            else if (null != actionSymbol.After)
             {
-                actionElement.After = actionTuple.After;
+                actionElement.After = actionSymbol.After;
             }
-            else if (actionTuple.Sequence.HasValue)
+            else if (actionSymbol.Sequence.HasValue)
             {
-                actionElement.Sequence = actionTuple.Sequence.Value;
+                actionElement.Sequence = actionSymbol.Sequence.Value;
             }
         }
 
@@ -2507,53 +2507,53 @@ namespace WixToolset.Core.WindowsInstaller
 
                     if (null != table)
                     {
-                        var actionTuples = new List<WixActionTuple>();
+                        var actionSymbols = new List<WixActionSymbol>();
                         var needAbsoluteScheduling = this.SuppressRelativeActionSequencing;
-                        var nonSequencedActionRows = new Dictionary<string, WixActionTuple>();
-                        var suppressedRelativeActionRows = new Dictionary<string, WixActionTuple>();
+                        var nonSequencedActionRows = new Dictionary<string, WixActionSymbol>();
+                        var suppressedRelativeActionRows = new Dictionary<string, WixActionSymbol>();
 
                         // create a sorted array of actions in this table
                         foreach (var row in table.Rows)
                         {
                             var action = row.FieldAsString(0);
-                            var actionTuple = new WixActionTuple(null, new Identifier(AccessModifier.Public, sequenceTable, action));
+                            var actionSymbol = new WixActionSymbol(null, new Identifier(AccessModifier.Public, sequenceTable, action));
 
-                            actionTuple.Action = action;
+                            actionSymbol.Action = action;
 
                             if (null != row[1])
                             {
-                                actionTuple.Condition = Convert.ToString(row[1]);
+                                actionSymbol.Condition = Convert.ToString(row[1]);
                             }
 
-                            actionTuple.Sequence = Convert.ToInt32(row[2]);
+                            actionSymbol.Sequence = Convert.ToInt32(row[2]);
 
-                            actionTuple.SequenceTable = sequenceTable;
+                            actionSymbol.SequenceTable = sequenceTable;
 
-                            actionTuples.Add(actionTuple);
+                            actionSymbols.Add(actionSymbol);
                         }
-                        actionTuples = actionTuples.OrderBy(t => t.Sequence).ToList();
+                        actionSymbols = actionSymbols.OrderBy(t => t.Sequence).ToList();
 
-                        for (var i = 0; i < actionTuples.Count && !needAbsoluteScheduling; i++)
+                        for (var i = 0; i < actionSymbols.Count && !needAbsoluteScheduling; i++)
                         {
-                            var actionTuple = actionTuples[i];
-                            this.StandardActions.TryGetValue(actionTuple.Id.Id, out var standardActionRow);
+                            var actionSymbol = actionSymbols[i];
+                            this.StandardActions.TryGetValue(actionSymbol.Id.Id, out var standardActionRow);
 
                             // create actions for custom actions, dialogs, AppSearch when its moved, and standard actions with non-standard conditions
-                            if ("AppSearch" == actionTuple.Action || null == standardActionRow || actionTuple.Condition != standardActionRow.Condition)
+                            if ("AppSearch" == actionSymbol.Action || null == standardActionRow || actionSymbol.Condition != standardActionRow.Condition)
                             {
-                                WixActionTuple previousActionTuple = null;
-                                WixActionTuple nextActionTuple = null;
+                                WixActionSymbol previousActionSymbol = null;
+                                WixActionSymbol nextActionSymbol = null;
 
                                 // find the previous action row if there is one
                                 if (0 <= i - 1)
                                 {
-                                    previousActionTuple = actionTuples[i - 1];
+                                    previousActionSymbol = actionSymbols[i - 1];
                                 }
 
                                 // find the next action row if there is one
-                                if (actionTuples.Count > i + 1)
+                                if (actionSymbols.Count > i + 1)
                                 {
-                                    nextActionTuple = actionTuples[i + 1];
+                                    nextActionSymbol = actionSymbols[i + 1];
                                 }
 
                                 // the logic for setting the before or after attribute for an action:
@@ -2565,47 +2565,47 @@ namespace WixToolset.Core.WindowsInstaller
                                 // 6. If this action is AppSearch and has all standard information, ignore it.
                                 // 7. If this action is standard and has a non-standard condition, create the action without any scheduling information.
                                 // 8. Everything must be absolutely sequenced.
-                                if ((null != previousActionTuple && actionTuple.Sequence == previousActionTuple.Sequence) || (null != nextActionTuple && actionTuple.Sequence == nextActionTuple.Sequence))
+                                if ((null != previousActionSymbol && actionSymbol.Sequence == previousActionSymbol.Sequence) || (null != nextActionSymbol && actionSymbol.Sequence == nextActionSymbol.Sequence))
                                 {
                                     needAbsoluteScheduling = true;
                                 }
-                                else if (null != nextActionTuple && this.StandardActions.ContainsKey(nextActionTuple.Id.Id) && actionTuple.Sequence + 1 == nextActionTuple.Sequence)
+                                else if (null != nextActionSymbol && this.StandardActions.ContainsKey(nextActionSymbol.Id.Id) && actionSymbol.Sequence + 1 == nextActionSymbol.Sequence)
                                 {
-                                    actionTuple.Before = nextActionTuple.Action;
+                                    actionSymbol.Before = nextActionSymbol.Action;
                                 }
-                                else if (null != previousActionTuple && this.StandardActions.ContainsKey(previousActionTuple.Id.Id) && actionTuple.Sequence - 1 == previousActionTuple.Sequence)
+                                else if (null != previousActionSymbol && this.StandardActions.ContainsKey(previousActionSymbol.Id.Id) && actionSymbol.Sequence - 1 == previousActionSymbol.Sequence)
                                 {
-                                    actionTuple.After = previousActionTuple.Action;
+                                    actionSymbol.After = previousActionSymbol.Action;
                                 }
-                                else if (null == standardActionRow && null != previousActionTuple && actionTuple.Sequence - 1 == previousActionTuple.Sequence && previousActionTuple.Before != actionTuple.Action)
+                                else if (null == standardActionRow && null != previousActionSymbol && actionSymbol.Sequence - 1 == previousActionSymbol.Sequence && previousActionSymbol.Before != actionSymbol.Action)
                                 {
-                                    actionTuple.After = previousActionTuple.Action;
+                                    actionSymbol.After = previousActionSymbol.Action;
                                 }
-                                else if (null == standardActionRow && null != previousActionTuple && actionTuple.Sequence != previousActionTuple.Sequence && null != nextActionTuple && actionTuple.Sequence + 1 == nextActionTuple.Sequence)
+                                else if (null == standardActionRow && null != previousActionSymbol && actionSymbol.Sequence != previousActionSymbol.Sequence && null != nextActionSymbol && actionSymbol.Sequence + 1 == nextActionSymbol.Sequence)
                                 {
-                                    actionTuple.Before = nextActionTuple.Action;
+                                    actionSymbol.Before = nextActionSymbol.Action;
                                 }
-                                else if ("AppSearch" == actionTuple.Action && null != standardActionRow && actionTuple.Sequence == standardActionRow.Sequence && actionTuple.Condition == standardActionRow.Condition)
+                                else if ("AppSearch" == actionSymbol.Action && null != standardActionRow && actionSymbol.Sequence == standardActionRow.Sequence && actionSymbol.Condition == standardActionRow.Condition)
                                 {
                                     // ignore an AppSearch row which has the WiX standard sequence and a standard condition
                                 }
-                                else if (null != standardActionRow && actionTuple.Condition != standardActionRow.Condition) // standard actions get their standard sequence numbers
+                                else if (null != standardActionRow && actionSymbol.Condition != standardActionRow.Condition) // standard actions get their standard sequence numbers
                                 {
-                                    nonSequencedActionRows.Add(actionTuple.Id.Id, actionTuple);
+                                    nonSequencedActionRows.Add(actionSymbol.Id.Id, actionSymbol);
                                 }
-                                else if (0 < actionTuple.Sequence)
+                                else if (0 < actionSymbol.Sequence)
                                 {
                                     needAbsoluteScheduling = true;
                                 }
                             }
                             else
                             {
-                                suppressedRelativeActionRows.Add(actionTuple.Id.Id, actionTuple);
+                                suppressedRelativeActionRows.Add(actionSymbol.Id.Id, actionSymbol);
                             }
                         }
 
                         // create the actions now that we know if they must be absolutely or relatively scheduled
-                        foreach (var actionRow in actionTuples)
+                        foreach (var actionRow in actionSymbols)
                         {
                             var key = actionRow.Id.Id;
 
@@ -2650,7 +2650,7 @@ namespace WixToolset.Core.WindowsInstaller
                     {
                         foreach (var row in table.Rows)
                         {
-                            var actionRow = new WixActionTuple(null, new Identifier(AccessModifier.Public, sequenceTable, row.FieldAsString(0)));
+                            var actionRow = new WixActionSymbol(null, new Identifier(AccessModifier.Public, sequenceTable, row.FieldAsString(0)));
 
                             actionRow.Action = row.FieldAsString(0);
 
diff --git a/src/WixToolset.Core.WindowsInstaller/Differ.cs b/src/WixToolset.Core.WindowsInstaller/Differ.cs
index 0e1a7315..304d0152 100644
--- a/src/WixToolset.Core.WindowsInstaller/Differ.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Differ.cs
@@ -10,7 +10,7 @@ namespace WixToolset.Core.WindowsInstaller
     using System.Globalization;
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Data.WindowsInstaller.Rows;
     using WixToolset.Extensibility;
diff --git a/src/WixToolset.Core.WindowsInstaller/ExtensibilityServices/WindowsInstallerBackendHelper.cs b/src/WixToolset.Core.WindowsInstaller/ExtensibilityServices/WindowsInstallerBackendHelper.cs
index a1df335c..0082bc7c 100644
--- a/src/WixToolset.Core.WindowsInstaller/ExtensibilityServices/WindowsInstallerBackendHelper.cs
+++ b/src/WixToolset.Core.WindowsInstaller/ExtensibilityServices/WindowsInstallerBackendHelper.cs
@@ -9,34 +9,34 @@ namespace WixToolset.Core.WindowsInstaller.ExtensibilityServices
 
     internal class WindowsInstallerBackendHelper : IWindowsInstallerBackendHelper
     {
-        public Row CreateRow(IntermediateSection section, IntermediateTuple tuple, WindowsInstallerData output, TableDefinition tableDefinition)
+        public Row CreateRow(IntermediateSection section, IntermediateSymbol symbol, WindowsInstallerData output, TableDefinition tableDefinition)
         {
             var table = output.EnsureTable(tableDefinition);
 
-            var row = table.CreateRow(tuple.SourceLineNumbers);
+            var row = table.CreateRow(symbol.SourceLineNumbers);
             row.SectionId = section.Id;
 
             return row;
         }
 
-        public bool TryAddTupleToOutputMatchingTableDefinitions(IntermediateSection section, IntermediateTuple tuple, WindowsInstallerData output, TableDefinitionCollection tableDefinitions)
+        public bool TryAddSymbolToOutputMatchingTableDefinitions(IntermediateSection section, IntermediateSymbol symbol, WindowsInstallerData output, TableDefinitionCollection tableDefinitions)
         {
-            var tableDefinition = tableDefinitions.FirstOrDefault(t => t.TupleDefinition?.Name == tuple.Definition.Name);
+            var tableDefinition = tableDefinitions.FirstOrDefault(t => t.SymbolDefinition?.Name == symbol.Definition.Name);
             if (tableDefinition == null)
             {
                 return false;
             }
 
-            var row = this.CreateRow(section, tuple, output, tableDefinition);
+            var row = this.CreateRow(section, symbol, output, tableDefinition);
             var rowOffset = 0;
 
-            if (tableDefinition.TupleIdIsPrimaryKey)
+            if (tableDefinition.SymbolIdIsPrimaryKey)
             {
-                row[0] = tuple.Id.Id;
+                row[0] = symbol.Id.Id;
                 rowOffset = 1;
             }
 
-            for (var i = 0; i < tuple.Fields.Length; ++i)
+            for (var i = 0; i < symbol.Fields.Length; ++i)
             {
                 if (i < tableDefinition.Columns.Length)
                 {
@@ -45,11 +45,11 @@ namespace WixToolset.Core.WindowsInstaller.ExtensibilityServices
                     switch (column.Type)
                     {
                     case ColumnType.Number:
-                        row[i + rowOffset] = column.Nullable ? tuple.AsNullableNumber(i) : tuple.AsNumber(i);
+                        row[i + rowOffset] = column.Nullable ? symbol.AsNullableNumber(i) : symbol.AsNumber(i);
                         break;
 
                     default:
-                        row[i + rowOffset] = tuple.AsString(i);
+                        row[i + rowOffset] = symbol.AsString(i);
                         break;
                     }
                 }
diff --git a/src/WixToolset.Core.WindowsInstaller/MspBackend.cs b/src/WixToolset.Core.WindowsInstaller/MspBackend.cs
index 5dc64445..46ff7aa3 100644
--- a/src/WixToolset.Core.WindowsInstaller/MspBackend.cs
+++ b/src/WixToolset.Core.WindowsInstaller/MspBackend.cs
@@ -10,7 +10,7 @@ namespace WixToolset.Core.WindowsInstaller
     using WixToolset.Core.WindowsInstaller.Msi;
     using WixToolset.Core.WindowsInstaller.Unbind;
     using WixToolset.Data;
-    using WixToolset.Data.Tuples;
+    using WixToolset.Data.Symbols;
     using WixToolset.Data.WindowsInstaller;
     using WixToolset.Extensibility;
     using WixToolset.Extensibility.Data;