nxml-mode, docbook, xinclude

Hi,

I'm using nxml-mode to validate my Docbook and so on as I write, but
I've hit a small annoyance.  In my current document I'm using XInclude
to bring in source code snippets but nxml is for obviously reasons
marking <xi:include .../> as invalid.  Is there a way to get nxml-mode
to ignore certain namespaces or some other cunning way around this? 
If I could say that all http://www.w3.org/2001/XInclude namespaced
nodes are valid anywhere (and then should be validated with another
schema for bonus points) then that would be great.

Cheers,
Ross


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