Ultimately i am trying to check if the items in $s1 can
also be found in $s2.
For example -
as these are both subsets of the same set of nodes you presumably mean
node identity here rather than value equality. You don't need
any loops
at all for that
count($s1|$s2)=count($s2)
is true just if all the items in s1 are in s2.
I read the problem as being based on equality rather than identity of nodes,
but I might not have read carefully enough...
Michael Kay
http://www.saxonica.com/
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