> I see that several people are using the functions 
> "substring-after" and
> "substring".
> 
> I could find no mention of them in http://www.w3.org/TR/xslt.

This is actually an XPath function - see http://www.w3.org/TR/xpath or pgs.
512 - 520 in Mike Kay's book for documentation on them,

Ben


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