diff -r 000000000000 -r 6474c204b198 dom/interfaces/xpath/nsIDOMXPathResult.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/xpath/nsIDOMXPathResult.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/**
+ * Corresponds to http://www.w3.org/TR/2002/WD-DOM-Level-3-XPath-20020208
+ */
+
+#include "domstubs.idl"
+
+interface XPathException;
+
+[scriptable, uuid(75506f84-b504-11d5-a7f2-ca108ab8b6fc)]
+interface nsIDOMXPathResult : nsISupports
+{
+  // XPathResultType
+  const unsigned short      ANY_TYPE                       = 0;
+  const unsigned short      NUMBER_TYPE                    = 1;
+  const unsigned short      STRING_TYPE                    = 2;
+  const unsigned short      BOOLEAN_TYPE                   = 3;
+  const unsigned short      UNORDERED_NODE_ITERATOR_TYPE   = 4;
+  const unsigned short      ORDERED_NODE_ITERATOR_TYPE     = 5;
+  const unsigned short      UNORDERED_NODE_SNAPSHOT_TYPE   = 6;
+  const unsigned short      ORDERED_NODE_SNAPSHOT_TYPE     = 7;
+  const unsigned short      ANY_UNORDERED_NODE_TYPE        = 8;
+  const unsigned short      FIRST_ORDERED_NODE_TYPE        = 9;
+
+  readonly attribute unsigned short   resultType;
+  readonly attribute double           numberValue;
+                                      // raises(XPathException) on retrieval
+
+  readonly attribute DOMString        stringValue;
+                                      // raises(XPathException) on retrieval
+
+  readonly attribute boolean          booleanValue;
+                                      // raises(XPathException) on retrieval
+
+  readonly attribute nsIDOMNode       singleNodeValue;
+                                      // raises(XPathException) on retrieval
+
+  readonly attribute boolean          invalidIteratorState;
+  readonly attribute unsigned long    snapshotLength;
+                                      // raises(XPathException) on retrieval
+
+  nsIDOMNode               iterateNext()
+                                      raises(XPathException, 
+                                             DOMException);
+  nsIDOMNode               snapshotItem(in unsigned long index)
+                                      raises(XPathException);
+};