I have a set of elements ("t") with children under them
("t/cSet/c"). I'm looking for children that occur twice.
I'd like get a nice 1.0 nodeset, which is the practical
reason for trying to shoehorn the task into a single statement.
In 1.0, use keys as David Carlisle showed.
In 2.0:
<xsl:variable name="children-that-occur-twice">
<xsl:for-each-group select="t" group-by="t/cSet/c"/>
<xsl:sequence select="current-group()[last()=2]"/>
</xsl:for-each-group>
</xsl:variable>
Michael Kay
http://www.saxonica.com/
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