grouping assignment
I tried this before, but I got the error: A sequence of more
than one item is not allowed as the first argument of
saxon:evaluate().
Sorry, it should of course be
group-by="string-join(receiver, operation, prev_bus_state, data,
for $x in $groupingKeys/key return saxon:evaluate($x), '|'))"
Michael Kay
http://www.saxonica.com/
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