not looked in detail at your example, just perhaps just answering this
bit iis enough
I am familiar with keys and get get lists of unigue items and group
them but I cannot exclude the items that do not appear in all
StudyGroups...
one way
<xsl:key name="sg" match="studyroup" use="item"/>
then <xsl:variable name="n" select="count(studygroup)"/>
so to know if . the current item is in all groups you can test
count(key('sg',.))=$n
as if it is in all groups then the key will return them all
David
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