But I obviously have a fundamental misunderstanding: I know that the
select expression in the original call returns a node-set, which the
XSLT processor apparently converts automatically to a string when
evaluating the test expression (as desired, since I get the intended
language names in my output).
When you compare a node-set to a string, the result is true if any node in
the node-set matches the string. If the node-set is empty, there's no node
that matches the string, so the result is false (regardless of the value of
the string).
Michael Kay
http://www.saxonica.com/
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