diff -r 000000000000 -r 4f2f89ce4247 WebCore/xml/XMLSerializer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/xml/XMLSerializer.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (C) 2003, 2006 Apple Inc. All rights reserved.
+ *  Copyright (C) 2006 Samuel Weinig (sam@webkit.org)
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "XMLSerializer.h"
+
+#include "Document.h"
+#include "ExceptionCode.h"
+#include "markup.h"
+
+namespace WebCore {
+
+String XMLSerializer::serializeToString(Node* node, ExceptionCode& ec)
+{
+    if (!node)
+        return String();
+
+    if (!node->document()) {
+        // Due to the fact that DocumentType nodes are created by the DOMImplementation
+        // and not the Document, it is possible for it to not have a Document associated
+        // with it.  It should be the only type of node where this is possible.
+        ASSERT(node->nodeType() == Node::DOCUMENT_TYPE_NODE);
+
+        ec = INVALID_ACCESS_ERR;
+        return String();
+    }
+
+    return createMarkup(node);
+}
+
+} // namespace WebCore