Obviously Microsoft forgot about XInclude when they were shipping Visual Studio, so when you edit your XML and use XInclude you get no intellisense. It's easy to fix though. Just get this XInclude schema (standard XInclude schema improved a bit by Laurens Holst) and drop it into
{Visual Studio install drive}:\Program Files\Microsoft Visual Studio 9.0\Xml\Schemas
Now it's better:
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