diff -r 000000000000 -r 6474c204b198 rdf/base/idl/rdfITripleVisitor.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rdf/base/idl/rdfITripleVisitor.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+/* -*- 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 nsIRDFResource;
+interface nsIRDFNode;
+
+/**
+ * Interface used in RDF to enumerate triples.
+ * Also used by rdfIDataSource::getAllSubjects, then aPredicate,
+ * aObject and aTruthValue are ignored.
+ *
+ * @status PLASMA
+ */
+
+[scriptable, function, uuid(aafea151-c271-4505-9978-a100d292800c)]
+interface rdfITripleVisitor : nsISupports
+{
+    /**
+     * Callback function for returning query results.
+     *
+     * @param aSubject, aPredicate, aObject describe the (sub-)arc
+     * @returnCode NS_RDF_STOP_VISIT to stop iterating over the query result.
+     *             Any error code will stop the iteration as well.
+     */
+    void visit(in nsIRDFNode aSubject, in nsIRDFResource aPredicate,
+               in nsIRDFNode aObject, in boolean aTruthValue);
+};