3 files changed, 28 insertions, 1 deletions

diff --git a/src/api/wix/WixToolset.Data/Symbols/WixPackageSymbol.cs b/src/api/wix/WixToolset.Data/Symbols/WixPackageSymbol.cs
index e1720033..4a112266 100644
--- a/src/api/wix/WixToolset.Data/Symbols/WixPackageSymbol.cs
+++ b/src/api/wix/WixToolset.Data/Symbols/WixPackageSymbol.cs
@@ -46,6 +46,12 @@ namespace WixToolset.Data.Symbols
         PerMachine = 0x1,
     }
 
+    public enum WixPackageUpgradeStrategy
+    {
+        None = 0x0,
+        MajorUpgrade = 0x1,
+    }
+
     public class WixPackageSymbol : IntermediateSymbol
     {
         public WixPackageSymbol() : base(SymbolDefinitions.WixPackage, null, null)
@@ -106,6 +112,12 @@ namespace WixToolset.Data.Symbols
             set => this.Set((int)WixPackageSymbolFields.Codepage, value);
         }
 
+        public WixPackageUpgradeStrategy UpgradeStrategy
+        {
+            get => (WixPackageUpgradeStrategy)this.Fields[(int)WixPackageSymbolFields.Attributes].AsNumber();
+            set => this.Set((int)WixPackageSymbolFields.Attributes, (int)value);
+        }
+
         public bool PerMachine => (this.Attributes & WixPackageAttributes.PerMachine) == WixPackageAttributes.PerMachine;
     }
 }
diff --git a/src/api/wix/WixToolset.Data/WixStandardLibrary.cs b/src/api/wix/WixToolset.Data/WixStandardLibrary.cs
index 3758e5b1..3f851f09 100644
--- a/src/api/wix/WixToolset.Data/WixStandardLibrary.cs
+++ b/src/api/wix/WixToolset.Data/WixStandardLibrary.cs
@@ -32,7 +32,17 @@ namespace WixToolset.Data
 
         private static IEnumerable<Localization> YieldLocalizations()
         {
-            var strings = new BindVariable[0];
+            var sourceLineNumber = new SourceLineNumber("wixstd.wixlib");
+
+            var strings = new[] {
+                new BindVariable()
+                {
+                    SourceLineNumbers = sourceLineNumber,
+                    Id = "WixDowngradePreventedMessage",
+                    Value = "A newer version of [ProductName] is already installed.",
+                    Overridable = true,
+                },
+            };
 
             var localizedControls = new LocalizedControl[0];
 
diff --git a/src/api/wix/WixToolset.Data/WixStandardLibraryIdentifiers.cs b/src/api/wix/WixToolset.Data/WixStandardLibraryIdentifiers.cs
index 6579a42b..73e4245b 100644
--- a/src/api/wix/WixToolset.Data/WixStandardLibraryIdentifiers.cs
+++ b/src/api/wix/WixToolset.Data/WixStandardLibraryIdentifiers.cs
@@ -21,5 +21,10 @@ namespace WixToolset.Data
         /// Default feature name.
         /// </summary>
         public static readonly string DefaultFeatureName = "WixDefaultFeature";
+
+        /// <summary>
+        /// WiX Standard localization strings.
+        /// </summary>
+        public static readonly string WixStandardLocalizationStrings = "WixStandardLocalizationStrings";
     }
 }