Upstream xoofx/markdig state of the touched files before 67a2e4948f

src/Markdig/Extensions/AutoIdentifiers/HeadingLinkReferenceDefinition.cs

@@ -0,0 +1,27 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license. 
+// See the license.txt file in the project root for more information.
+
+using Markdig.Syntax;
+
+namespace Markdig.Extensions.AutoIdentifiers;
+
+/// <summary>
+/// A link reference definition to a <see cref="HeadingBlock"/> stored at the <see cref="MarkdownDocument"/> level.
+/// </summary>
+/// <seealso cref="LinkReferenceDefinition" />
+public class HeadingLinkReferenceDefinition : LinkReferenceDefinition
+{
+    /// <summary>
+    /// Initializes a new instance of the HeadingLinkReferenceDefinition class.
+    /// </summary>
+    public HeadingLinkReferenceDefinition(HeadingBlock headling)
+    {
+        Heading = headling;
+    }
+
+    /// <summary>
+    /// Gets or sets the heading related to this link reference definition.
+    /// </summary>
+    public HeadingBlock Heading { get; set; }
+}