 	 * @toc-path Extensions/HTML
 	 * @toc-sort 1/2
 	 */
-	public class XHTMLExtension extends Extension implements IExtension
+	public class XHTMLExtension extends Extension implements IExtension, ISerializable
 	{
 		// Static class variables to be overridden in subclasses;
 		public static var NS:String = "http://www.w3.org/1999/xhtml";

		{
			super(parent);
		}
	
		/**
		 * Gets the namespace associated with this extension.

	 *
	 */
	
	import flash.xml.XMLDocument;
	import flash.xml.XMLNode;
	
	import org.jivesoftware.xiff.data.Extension;
	import org.jivesoftware.xiff.data.ExtensionClassRegistry;
	import org.jivesoftware.xiff.data.IExtension;
	import org.jivesoftware.xiff.data.ISerializable;
	
	/**
	 * This class provides an extension for XHTML body text in messages.
