diff -r 000000000000 -r 6474c204b198 rdf/base/idl/rdfISerializer.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rdf/base/idl/rdfISerializer.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; 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 "nsISupports.idl"
+
+interface rdfIDataSource;
+interface nsIOutputStream;
+
+/**
+ * Interface used to serialize RDF.
+ *
+ * @status PLASMA
+ */
+
+[scriptable, uuid(f0edfcdd-8bca-4d32-9226-7421001396a4)]
+interface rdfISerializer : nsISupports
+{
+    /**
+     * Synchronously serialize the given datasource to the outputstream.
+     *
+     * Implementations are not required to implement any buffering or
+     * other stream-based optimizations.
+     *
+     * @param aDataSource The RDF data source to be serialized.
+     * @param aOut The output stream to use.
+     */
+    void serialize(in rdfIDataSource aDataSource, in nsIOutputStream aOut);
+};