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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsICollection.idl b/src/libs/xpcom18a4/xpcom/ds/nsICollection.idl
new file mode 100644
index 00000000..f97bf970
--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/ds/nsICollection.idl
@@ -0,0 +1,92 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Scott Collins <scc@mozilla.org>: |do_QueryElementAt|
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsISerializable.idl"
+#include "nsIEnumerator.idl"
+
+[scriptable, uuid(83b6019c-cbc4-11d2-8cca-0060b0fc14a3)]
+interface nsICollection : nsISerializable
+{
+
+  PRUint32 Count();
+  nsISupports GetElementAt(in PRUint32 index);
+  void QueryElementAt(in PRUint32 index, in nsIIDRef uuid, 
+                      [iid_is(uuid),retval] out nsQIResult result);
+  void SetElementAt(in PRUint32 index, in nsISupports item);
+  void AppendElement(in nsISupports item);
+  void RemoveElement(in nsISupports item);
+
+  nsIEnumerator Enumerate();
+
+  void Clear();
+
+};
+
+%{C++
+
+#ifndef nsCOMPtr_h__
+#include "nsCOMPtr.h"
+#endif
+
+class NS_COM nsQueryElementAt : public nsCOMPtr_helper
+  {
+    public:
+      nsQueryElementAt( nsICollection* aCollection, PRUint32 aIndex, nsresult* aErrorPtr )
+          : mCollection(aCollection),
+            mIndex(aIndex),
+            mErrorPtr(aErrorPtr)
+        {
+          // nothing else to do here
+        }
+
+      virtual nsresult NS_FASTCALL operator()( const nsIID& aIID, void** ) const;
+
+    private:
+      nsICollection*  mCollection;
+      PRUint32        mIndex;
+      nsresult*       mErrorPtr;
+  };
+
+inline
+const nsQueryElementAt
+do_QueryElementAt( nsICollection* aCollection, PRUint32 aIndex, nsresult* aErrorPtr = 0 )
+  {
+    return nsQueryElementAt(aCollection, aIndex, aErrorPtr);
+  }
+
+%}