Sequence count vs. context position

Dear colleagues,

I am somewhat puzzled by this situation:

key('keyNameb, $keyValue)[1]

>From an example in Michael Kaybs XSLT 2.0 bible and the description of
position(), I learn that this form selects the first item in the sequence of
nodes returned by key().

How would I have to write the expression, if I wanted to filter only those
nodes, which are at position 1 in their respective document context? I know I
can have predicates which consider the context of all returned nodes, looking
at ancestors etc. But somehow position() seems to be special.

Thanks a lot,
Michael

Michael MC<ller-Hillebrand
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