2 files changed, 35 insertions, 0 deletions

diff --git a/src/WixToolset.Extensibility/Data/IIncludedFile.cs b/src/WixToolset.Extensibility/Data/IIncludedFile.cs
new file mode 100644
index 00000000..ac5e604c
--- /dev/null
+++ b/src/WixToolset.Extensibility/Data/IIncludedFile.cs
@@ -0,0 +1,21 @@
+// 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.Extensibility.Data
+{
+    using WixToolset.Data;
+
+    public interface IIncludedFile
+    {
+        /// <summary>
+        /// Gets the full path of the included file.
+        /// </summary>
+        /// <value>The full path of the included file.</value>
+        string Path { get; set; }
+
+        /// <summary>
+        /// Gets the source line numbers.
+        /// </summary>
+        /// <value>The source line numbers.</value>
+        SourceLineNumber SourceLineNumbers { get; set; }
+    }
+}
diff --git a/src/WixToolset.Extensibility/Data/IPreprocessResult.cs b/src/WixToolset.Extensibility/Data/IPreprocessResult.cs
new file mode 100644
index 00000000..955c0ced
--- /dev/null
+++ b/src/WixToolset.Extensibility/Data/IPreprocessResult.cs
@@ -0,0 +1,14 @@
+// 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.Extensibility.Data
+{
+    using System.Collections.Generic;
+    using System.Xml.Linq;
+
+    public interface IPreprocessResult
+    {
+        XDocument Document { get; set; }
+
+        IEnumerable<IIncludedFile> IncludedFiles { get; set; }
+    }
+}