I don't think so. Personnaly, I use the three-parameters
version of key() only when I need a subtree, not a document.
If I just need to set the context node for the calling point,
I use instead:
$input/key('things-by-a', .)
But I guess it is a matter of taste.
I tend to use the 3-arg form. It's not just a matter of taste,
key('things-by-a', ., $input)
doesn't mean the same as
$input/key('things-by-a', .)
because the context node "." is different in the two cases, which will often
affect the evaluation of the second argument.
Michael Kay
http://www.saxonica.com/
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