You want to be able to guarantee the
string value you construct will be coherent with the
namespaces in scope (bound to a well-known set of prefixes).
That is not possible in XSLT 1.0.
I don't think that's strictly true. It's certainly possible with XSLT 1.0 to
copy namespace nodes from a source document to a result document, and that
gives you most of the capability needed; though in the absence of the
xsl:namespace instruction it can involve some clumsy work-arounds. There's
also sometimes a theoretical risk that prefixes will be changed because XSLT
1.0 permits it - but mainstream processors all do the decent thing in
straightforward cases.
Michael Kay
http://www.saxonica.com/
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