I think it's conceivable that two different XSLT processors
could return attributes in a different order.... but the same
processor on the same run?
For the same attributes on the same element, yes (in fact, the data model
requires the order to be stable): but for the "same" attributes on different
elements, no. It's entirely possible that attributes A, B on element E1 will
be in a different order from attributes A, B on element E2, and that the
grouping key formed using string-join(@*, '|') would be different in the two
cases even though the attributes are equal.
Michael Kay
http://www.saxonica.com/
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