select="$sections/section[(_at_)group=1]/item[(_at_)id=1][$pos]"/>
the $pos item node that is a child of section[(_at_)group=1]
and has @id=1.
Since you have uniue ids within each section, if $pos is 1
you should get the same as
select="$sections/section[(_at_)group=1]/item[(_at_)id=1]"/>
but id pos is any number other than 1 you should get nothing as
there is only one item in each step satisfying [(_at_)id=1] so position() is
always equal to 1.
David
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