Can't you run a three-level for-each so that you can compute all
three numbers in one go?
I have to admit, I don't understand what you have in mind here. But
that may be just because I'm dizzy with the prospect of one of the
earlier suggestions working. In any case, I won't ask you to explain
it in further detail unless I can't get one of the other suggestions
working reasonably soon.
Thanks, both for this and all you do on xsl-list.
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