> In the application I'm trying to complete, I'm trying to introduce a
> "configurable" aspect to the application by giving the client control over
> the XML file. 

You can do that, but you have to put _data_  in the users file which the
processor can use to customise its behaviour, you can't put in snippets
of XSLT/XPath code, any more than you'd expect a program written in C 
to be able to incorporate random bits of C source code embedded in a
document.

David

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