<xsl:variable name="g" select="//det[det_format!='test']/
this says select every det (that doesn't have det-format=test)
det_rep_group
then select its child det_rep_group
[generate-id()=generate-id(key('g',.))]"
/>if that
if that child is the first det_rep_group in the document with
they key value as specified by its content.
so you don't get the first <det_rep_group>10</det_rep_group>
because it has <det_format>test</det_format> and you don't get the
second <det_rep_group>10</det_rep_group> because that isn't the first
much node in _the document_.
You need your filter on the key to exactly match the filter on the
select when doing muenchian grouping. Which is exactly how you changed
the code. Then the select and the key are working on the same nodes, and
things work out as you expect.
David
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