* is it true that the above ($biogs/key( ...)) really is illegal in
XSLT 1.0?
yes
* what restriction was relaxed to make this possible in XSLT 2.0?
Xpath2 allows a lot more stuff in steps than Xpath 1 essentially any
expression so not only key() is allowed after / but things like
/a/b/(c|d|e/f)
you could only have a node test after / in xpath1 not an arbitrary
expression
David
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