1 files changed, 20 insertions, 0 deletions

diff --git a/src/api/burn/WixToolset.Mba.Core/IOverridableVariables.cs b/src/api/burn/WixToolset.Mba.Core/IOverridableVariables.cs
index 3944913b..1ffe50e4 100644
--- a/src/api/burn/WixToolset.Mba.Core/IOverridableVariables.cs
+++ b/src/api/burn/WixToolset.Mba.Core/IOverridableVariables.cs
@@ -5,11 +5,31 @@ namespace WixToolset.Mba.Core
     using System.Collections.Generic;
 
     /// <summary>
+    /// The case sensitivity of variables from the command line.
+    /// </summary>
+    public enum VariableCommandLineType
+    {
+        /// <summary>
+        /// Similar to Windows Installer, all variable names specified on the command line are automatically converted to upper case.
+        /// </summary>
+        UpperCase,
+        /// <summary>
+        /// All variable names specified on the command line must match the case specified when building the bundle.
+        /// </summary>
+        CaseSensitive,
+    }
+
+    /// <summary>
     /// Overridable variable information from the BA manifest.
     /// </summary>
     public interface IOverridableVariables
     {
         /// <summary>
+        /// The <see cref="VariableCommandLineType"/> of the bundle.
+        /// </summary>
+        VariableCommandLineType CommandLineType { get; }
+
+        /// <summary>
         /// Variable Dictionary of variable name to <see cref="IOverridableVariableInfo"/>.
         /// </summary>
         IDictionary<string, IOverridableVariableInfo> Variables { get; }