diff -r 000000000000 -r 6474c204b198 content/xul/templates/src/nsXULTemplateResultSetRDF.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/xul/templates/src/nsXULTemplateResultSetRDF.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,83 @@
+/* -*- 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 "nsXULTemplateResultSetRDF.h"
+#include "nsXULTemplateQueryProcessorRDF.h"
+
+NS_IMPL_ISUPPORTS(nsXULTemplateResultSetRDF, nsISimpleEnumerator)
+
+NS_IMETHODIMP
+nsXULTemplateResultSetRDF::HasMoreElements(bool *aResult)
+{
+    *aResult = true;
+
+    nsCOMPtr<nsIRDFNode> node;
+
+    if (! mInstantiations || ! mQuery) {
+        *aResult = false;
+        return NS_OK;
+    }
+
+    if (mCheckedNext) {
+        if (!mCurrent || mCurrent == &(mInstantiations->mHead))
+            *aResult = false;
+        return NS_OK;
+    }
+
+    mCheckedNext = true;
+                
+    do {
+        if (mCurrent) {
+            mCurrent = mCurrent->mNext;
+            if (mCurrent == &(mInstantiations->mHead)) {
+                *aResult = false;
+                return NS_OK;
+            }
+        }
+        else {
+            *aResult = ! mInstantiations->Empty();
+            if (*aResult)
+                mCurrent = mInstantiations->mHead.mNext;
+        }
+
+        // get the value of the member variable. If it is not set, skip
+        // the result and move on to the next result
+        if (mCurrent) {
+            mCurrent->mInstantiation.mAssignments.
+                GetAssignmentFor(mQuery->mMemberVariable, getter_AddRefs(node));
+        }
+
+        // only resources may be used as results
+        mResource = do_QueryInterface(node);
+    } while (! mResource);
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXULTemplateResultSetRDF::GetNext(nsISupports **aResult)
+{
+    if (!aResult)
+        return NS_ERROR_NULL_POINTER;
+
+    if (!mCurrent || !mCheckedNext)
+        return NS_ERROR_FAILURE;
+
+    nsRefPtr<nsXULTemplateResultRDF> nextresult =
+        new nsXULTemplateResultRDF(mQuery, mCurrent->mInstantiation, mResource);
+    if (!nextresult)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    // add the supporting memory elements to the processor's map. These are
+    // used to remove the results when an assertion is removed from the graph
+    mProcessor->AddMemoryElements(mCurrent->mInstantiation, nextresult);
+
+    mCheckedNext = false;
+
+    *aResult = nextresult;
+    NS_ADDREF(*aResult);
+
+    return NS_OK;
+}