Add project files.

Compat.Private.Serialization/Compat/Runtime/Serialization/XmlDataNode.cs

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+using System.Collections.Generic;
+using System.Xml;
+
+namespace Compat.Runtime.Serialization
+{
+    internal class XmlDataNode : DataNode<object>
+    {
+        private IList<XmlAttribute> _xmlAttributes;
+        private IList<XmlNode> _xmlChildNodes;
+        private XmlDocument _ownerDocument;
+
+        internal XmlDataNode()
+        {
+            dataType = Globals.TypeOfXmlDataNode;
+        }
+
+        internal IList<XmlAttribute> XmlAttributes
+        {
+            get => _xmlAttributes;
+            set => _xmlAttributes = value;
+        }
+
+        internal IList<XmlNode> XmlChildNodes
+        {
+            get => _xmlChildNodes;
+            set => _xmlChildNodes = value;
+        }
+
+        internal XmlDocument OwnerDocument
+        {
+            get => _ownerDocument;
+            set => _ownerDocument = value;
+        }
+
+        public override void Clear()
+        {
+            base.Clear();
+            _xmlAttributes = null;
+            _xmlChildNodes = null;
+            _ownerDocument = null;
+        }
+    }
+}