diff -r 000000000000 -r 6474c204b198 rdf/base/idl/nsIRDFInferDataSource.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rdf/base/idl/nsIRDFInferDataSource.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,28 @@
+/* -*- 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 "nsIRDFDataSource.idl"
+
+/**
+ * An nsIRDFInferDataSource is implemented by a infer engine. This
+ * engine mimics assertions in addition to those in the baseDataSource
+ * according to a particular vocabulary.
+ * Infer engines have contract IDs in the form of
+ * "@mozilla.org/rdf/infer-datasource;1?engine="
+ */
+
+[scriptable, uuid(2b04860f-4017-40f6-8a57-784a1e35077a)]
+interface nsIRDFInferDataSource : nsIRDFDataSource {
+    /**
+     *
+     * The wrapped datasource.
+     *
+     * The InferDataSource contains all arcs from the wrapped
+     * datasource plus those infered by the vocabulary implemented
+     * by the InferDataSource.
+     */
+    attribute nsIRDFDataSource baseDataSource;
+};
+