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diff --git a/src/WixToolset.Data/WindowsInstaller/Row.cs b/src/WixToolset.Data/WindowsInstaller/Row.cs
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+++ b/src/WixToolset.Data/WindowsInstaller/Row.cs
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+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Data.WindowsInstaller
+{
+    using System;
+    using System.Diagnostics;
+    using System.Globalization;
+    using System.Text;
+    using System.Xml;
+
+    /// <summary>
+    /// Row containing data for a table.
+    /// </summary>
+    public class Row
+    {
+        private static long rowCount;
+
+        /// <summary>
+        /// Creates a row that belongs to a table.
+        /// </summary>
+        /// <param name="sourceLineNumbers">Original source lines for this row.</param>
+        /// <param name="table">Table this row belongs to and should get its column definitions from.</param>
+        /// <remarks>The compiler should use this constructor exclusively.</remarks>
+        public Row(SourceLineNumber sourceLineNumbers, Table table)
+            : this(sourceLineNumbers, table.Definition)
+        {
+            this.Table = table;
+        }
+
+        /// <summary>
+        /// Creates a row that does not belong to a table.
+        /// </summary>
+        /// <param name="sourceLineNumbers">Original source lines for this row.</param>
+        /// <param name="tableDefinition">TableDefinition this row should get its column definitions from.</param>
+        /// <remarks>This constructor is used in cases where there isn't a clear owner of the row.  The linker uses this constructor for the rows it generates.</remarks>
+        public Row(SourceLineNumber sourceLineNumbers, TableDefinition tableDefinition)
+        {
+            this.Number = rowCount++;
+            this.SourceLineNumbers = sourceLineNumbers;
+            this.Fields = new Field[tableDefinition.Columns.Count];
+            this.TableDefinition = tableDefinition;
+
+            for (var i = 0; i < this.Fields.Length; ++i)
+            {
+                this.Fields[i] = Field.Create(this.TableDefinition.Columns[i]);
+            }
+        }
+
+        /// <summary>
+        /// Creates a shallow copy of a row from another row.
+        /// </summary>
+        /// <param name="source">The row the data is copied from.</param>
+        protected Row(Row source)
+        {
+            this.Table = source.Table;
+            this.TableDefinition = source.TableDefinition;
+            this.Number = source.Number;
+            this.Operation = source.Operation;
+            this.Redundant = source.Redundant;
+            this.SectionId = source.SectionId;
+            this.SourceLineNumbers = source.SourceLineNumbers;
+            this.Fields = source.Fields;
+        }
+
+        /// <summary>
+        /// Gets or sets the row transform operation.
+        /// </summary>
+        /// <value>The row transform operation.</value>
+        public RowOperation Operation { get; set; }
+
+        /// <summary>
+        /// Gets or sets wether the row is a duplicate of another row thus redundant.
+        /// </summary>
+        public bool Redundant { get; set; }
+
+        /// <summary>
+        /// Gets or sets the SectionId property on the row.
+        /// </summary>
+        /// <value>The SectionId property on the row.</value>
+        public string SectionId { get; set; }
+
+        /// <summary>
+        /// Gets the source file and line number for the row.
+        /// </summary>
+        /// <value>Source file and line number.</value>
+        public SourceLineNumber SourceLineNumbers { get; }
+
+        /// <summary>
+        /// Gets the table this row belongs to.
+        /// </summary>
+        /// <value>null if Row does not belong to a Table, or owner Table otherwise.</value>
+        public Table Table { get; }
+
+        /// <summary>
+        /// Gets the table definition for this row.
+        /// </summary>
+        /// <remarks>A Row always has a TableDefinition, even if the Row does not belong to a Table.</remarks>
+        /// <value>TableDefinition for Row.</value>
+        public TableDefinition TableDefinition { get; }
+
+        /// <summary>
+        /// Gets the fields contained by this row.
+        /// </summary>
+        /// <value>Array of field objects</value>
+        public Field[] Fields { get; }
+
+        /// <summary>
+        /// Gets the unique number for the row.
+        /// </summary>
+        /// <value>Number for row.</value>
+        public long Number { get; }
+
+        /// <summary>
+        /// Gets or sets the value of a particular field in the row.
+        /// </summary>
+        /// <param name="field">field index.</param>
+        /// <value>Value of a field in the row.</value>
+        public object this[int field]
+        {
+            get { return this.Fields[field].Data; }
+            set { this.Fields[field].Data = value; }
+        }
+
+        /// <summary>
+        /// Gets the field as an integer.
+        /// </summary>
+        /// <returns>Field's data as an integer.</returns>
+        public int FieldAsInteger(int field)
+        {
+            return this.Fields[field].AsInteger();
+        }
+
+        /// <summary>
+        /// Gets the field as an integer that could be null.
+        /// </summary>
+        /// <returns>Field's data as an integer that could be null.</returns>
+        public int? FieldAsNullableInteger(int field)
+        {
+            return this.Fields[field].AsNullableInteger();
+        }
+
+        /// <summary>
+        /// Gets the field as a string.
+        /// </summary>
+        /// <returns>Field's data as a string.</returns>
+        public string FieldAsString(int field)
+        {
+            return this.Fields[field].AsString();
+        }
+
+        /// <summary>
+        /// Sets the value of a particular field in the row without validating.
+        /// </summary>
+        /// <param name="field">field index.</param>
+        /// <param name="value">Value of a field in the row.</param>
+        /// <returns>True if successful, false if validation failed.</returns>
+        public bool BestEffortSetField(int field, object value)
+        {
+            return this.Fields[field].BestEffortSet(value);
+        }
+
+        /// <summary>
+        /// Get the value used to represent the row in a keyed row collection.
+        /// </summary>
+        /// <returns>Primary key or row number if no primary key is available.</returns>
+        public string GetKey()
+        {
+            return this.GetPrimaryKey() ?? Convert.ToString(this.Number, CultureInfo.InvariantCulture);
+        }
+
+        /// <summary>
+        /// Get the primary key of this row.
+        /// </summary>
+        /// <param name="delimiter">Delimiter character for multiple column primary keys.</param>
+        /// <returns>The primary key or null if the row's table has no primary key columns.</returns>
+        public string GetPrimaryKey(char delimiter = '/')
+        {
+            return this.GetPrimaryKey(delimiter, String.Empty);
+        }
+
+        /// <summary>
+        /// Get the primary key of this row.
+        /// </summary>
+        /// <param name="delimiter">Delimiter character for multiple column primary keys.</param>
+        /// <param name="nullReplacement">String to represent null values in the primary key.</param>
+        /// <returns>The primary key or null if the row's table has no primary key columns.</returns>
+        public string GetPrimaryKey(char delimiter, string nullReplacement)
+        {
+            var foundPrimaryKey = false;
+            var primaryKey = new StringBuilder();
+
+            foreach (var field in this.Fields)
+            {
+                if (field.Column.PrimaryKey)
+                {
+                    if (foundPrimaryKey)
+                    {
+                        primaryKey.Append(delimiter);
+                    }
+
+                    primaryKey.Append((null == field.Data) ? nullReplacement : Convert.ToString(field.Data, CultureInfo.InvariantCulture));
+
+                    foundPrimaryKey = true;
+                }
+                else // primary keys must be the first columns of a row so the first non-primary key means we can stop looking.
+                {
+                    break;
+                }
+            }
+
+            return foundPrimaryKey ? primaryKey.ToString() : null;
+        }
+
+        /// <summary>
+        /// Returns true if the specified field is null or an empty string.
+        /// </summary>
+        /// <param name="field">Index of the field to check.</param>
+        /// <returns>true if the specified field is null or an empty string, false otherwise.</returns>
+        public bool IsColumnEmpty(int field)
+        {
+            if (null == this.Fields[field].Data)
+            {
+                return true;
+            }
+
+            string dataString = this.Fields[field].Data as string;
+            if (null != dataString && 0 == dataString.Length)
+            {
+                return true;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Tests if the passed in row is identical.
+        /// </summary>
+        /// <param name="row">Row to compare against.</param>
+        /// <returns>True if two rows are identical.</returns>
+        public bool IsIdentical(Row row)
+        {
+            bool identical = (this.TableDefinition.Name == row.TableDefinition.Name && this.Fields.Length == row.Fields.Length);
+
+            for (var i = 0; identical && i < this.Fields.Length; ++i)
+            {
+                if (!(this.Fields[i].IsIdentical(row.Fields[i])))
+                {
+                    identical = false;
+                }
+            }
+
+            return identical;
+        }
+
+        /// <summary>
+        /// Returns a string representation of the Row.
+        /// </summary>
+        /// <returns>A string representation of the Row.</returns>
+        public override string ToString()
+        {
+            return String.Join("/", (object[])this.Fields);
+        }
+
+        /// <summary>
+        /// Creates a Row from the XmlReader.
+        /// </summary>
+        /// <param name="reader">Reader to get data from.</param>
+        /// <param name="table">Table for this row.</param>
+        /// <returns>New row object.</returns>
+        internal static Row Read(XmlReader reader, Table table)
+        {
+            Debug.Assert("row" == reader.LocalName);
+
+            bool empty = reader.IsEmptyElement;
+            RowOperation operation = RowOperation.None;
+            bool redundant = false;
+            string sectionId = null;
+            SourceLineNumber sourceLineNumbers = null;
+
+            while (reader.MoveToNextAttribute())
+            {
+                switch (reader.LocalName)
+                {
+                    case "op":
+                        operation = (RowOperation)Enum.Parse(typeof(RowOperation), reader.Value, true);
+                        break;
+                    case "redundant":
+                        redundant = reader.Value.Equals("yes");
+                        break;
+                    case "sectionId":
+                        sectionId = reader.Value;
+                        break;
+                    case "sourceLineNumber":
+                        sourceLineNumbers = SourceLineNumber.CreateFromEncoded(reader.Value);
+                        break;
+                }
+            }
+
+            var row = table.CreateRow(sourceLineNumbers);
+            row.Operation = operation;
+            row.Redundant = redundant;
+            row.SectionId = sectionId;
+
+            // loop through all the fields in a row
+            if (!empty)
+            {
+                var done = false;
+                var field = 0;
+
+                // loop through all the fields in a row
+                while (!done && reader.Read())
+                {
+                    switch (reader.NodeType)
+                    {
+                        case XmlNodeType.Element:
+                            switch (reader.LocalName)
+                            {
+                                case "field":
+                                    if (row.Fields.Length <= field)
+                                    {
+                                        if (!reader.IsEmptyElement)
+                                        {
+                                            throw new XmlException();
+                                        }
+                                    }
+                                    else
+                                    {
+                                        row.Fields[field].Read(reader);
+                                    }
+                                    ++field;
+                                    break;
+                                default:
+                                    throw new XmlException();
+                            }
+                            break;
+                        case XmlNodeType.EndElement:
+                            done = true;
+                            break;
+                    }
+                }
+
+                if (!done)
+                {
+                    throw new XmlException();
+                }
+            }
+
+            return row;
+        }
+
+        /// <summary>
+        /// Persists a row in an XML format.
+        /// </summary>
+        /// <param name="writer">XmlWriter where the Row should persist itself as XML.</param>
+        internal void Write(XmlWriter writer)
+        {
+            writer.WriteStartElement("row", Intermediate.XmlNamespaceUri);
+
+            if (RowOperation.None != this.Operation)
+            {
+                writer.WriteAttributeString("op", this.Operation.ToString().ToLowerInvariant());
+            }
+
+            if (this.Redundant)
+            {
+                writer.WriteAttributeString("redundant", "yes");
+            }
+
+            if (null != this.SectionId)
+            {
+                writer.WriteAttributeString("sectionId", this.SectionId);
+            }
+
+            if (null != this.SourceLineNumbers)
+            {
+                writer.WriteAttributeString("sourceLineNumber", this.SourceLineNumbers.GetEncoded());
+            }
+
+            for (int i = 0; i < this.Fields.Length; ++i)
+            {
+                this.Fields[i].Write(writer);
+            }
+
+            writer.WriteEndElement();
+        }
+    }
+}