> That would be so, except the generate-id() function has already filtered 
> out all but the first of the nodes returned by the key() function.... it 
> only operates on the first node in the set, when its argument is a node
set 
> (since it returns a string, it has to pick one node and that's the one it 
> picks).

That makes sense.  My understanding is that I'm picking up the context of
the nodes in the for-each and comparing the first nodes of each group
matching the respective dataIds (there are multiple groups of nodes each
with a different dataId).  This may be a ambiguity or even bug, the key
reference should probably make it explicit?



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