diff -r 000000000000 -r 6474c204b198 dom/xslt/base/txNamespaceMap.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/xslt/base/txNamespaceMap.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- 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/. */
+
+#ifndef TRANSFRMX_TXNAMESPACEMAP_H
+#define TRANSFRMX_TXNAMESPACEMAP_H
+
+#include "nsIAtom.h"
+#include "nsCOMArray.h"
+#include "nsTArray.h"
+
+class txNamespaceMap
+{
+public:
+    txNamespaceMap();
+    txNamespaceMap(const txNamespaceMap& aOther);
+
+    nsrefcnt AddRef()
+    {
+        return ++mRefCnt;
+    }
+    nsrefcnt Release()
+    {
+        if (--mRefCnt == 0) {
+            mRefCnt = 1; //stabilize
+            delete this;
+            return 0;
+        }
+        return mRefCnt;
+    }
+
+    nsresult mapNamespace(nsIAtom* aPrefix, const nsAString& aNamespaceURI);
+    int32_t lookupNamespace(nsIAtom* aPrefix);
+    int32_t lookupNamespaceWithDefault(const nsAString& aPrefix);
+
+private:
+    nsAutoRefCnt mRefCnt;
+    nsCOMArray<nsIAtom> mPrefixes;
+    nsTArray<int32_t> mNamespaces;
+};
+
+#endif //TRANSFRMX_TXNAMESPACEMAP_H