diff -r 000000000000 -r 6474c204b198 rdf/base/idl/nsIRDFXMLSerializer.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rdf/base/idl/nsIRDFXMLSerializer.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIAtom.idl"
+#include "nsISupports.idl"
+#include "nsIRDFDataSource.idl"
+
+[scriptable, uuid(8ae1fbf8-1dd2-11b2-bd21-d728069cca92)]
+interface nsIRDFXMLSerializer : nsISupports
+{
+    /**
+     * Initialize the serializer with the specified datasource.
+     * @param aDataSource the datasource from which data will be
+     *   serialized
+     */
+    void init(in nsIRDFDataSource aDataSource);
+
+    /**
+     * Add the specified namespace to the serializer.
+     * @param aPrefix the attribute namespace prefix
+     * @param aURI the namespace URI
+     */
+    void addNameSpace(in nsIAtom aPrefix, in DOMString aURI);
+};