XSLT can not see tags in the document (so doesn't have a concept of
tagName) but I'll assume you mean element name, even though elements and
tags are very differentt hings.
<when test="the current tagName/@idref is the first tagName/@idref in
usage">
that would be in XSLT 2
test=". is (ancestor::usage[1]//tagName[(_at_)idref=current()/@idref])[1]"
or in XSLT 11
test="generate-id() =
generate-id((ancestor::usage[1]//tagName[(_at_)idref=current()/@idref])[1])"
--
http://www.dcarlisle.demon.co.uk/matthew
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