Re: giving key() a context (changes between XSLT 1.0 a

 * 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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