i know its late in the day re XSLT / XPATH 2.0 drafts,
but doesnt this scenario sort of 'scream out' for a boolean function
that tests for type, both basic (node, string, number) and schema ?
There is such a construct: e.g. ($x instance of xs:decimal)
But in this case, I interpreted the requirement as being not to test whether
the attribute had a numeric type (ie. was defined as a number in the
schema), but whether its value had the lexical form of a number. The XPath
2.0 construct for this is ($x castable as xs:decimal).
Michael Kay
http://www.saxonica.com/
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