While Hugh's answer might work, the method used in his first for-each select is
kind of an odd way of doing Muenchian grouping in XSLT 1.0. Here's the approach
with the standard method:...
Both methods
count(A) = count(A|B)
and
generate-id(A) = generate-id(B)
are perfectly acceptable and "standard" ways of comparing node identity
in XSLT 1.0. Years ago Jeni did some measurements and found that in some
processors the first was faster, in others the second was faster. Both
are in common use.
(I seem to remember that the generate-id() method was much slower in
Saxon, but I then optimized it in the next release to compare node
identity directly without actually computing the IDs.)
Michael Kay
Saxonica
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