using a combination of exslt set functions (pure xslt)
http://www.exslt.org/set/functions/difference/index.html
you can achieve this in XSLT 1.0
In XSLT 2.0 one has access to these XPATH 2 funcs e.g. set difference,
intersection and union operators.
http://www.saxonica.com/documentation/expressions/except.html
gl, Jim Fuller
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