for $x at $i in blah
group by $x/@a
return
if ($i mod 10000 eq 0) then ..... else .....
Now the problem is that XQuery (of the eXist variety) denies knowledge of
the existence of the $i variable in the return clause. Presumably this is
because the group construct interferes with the lexical scoping.
I do not have to do this with XQuery as I can solve it downstream but I
would be interested in learning more about this scenario.
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