Mengen: Schnittmenge (Kaysian Technique )
<xsl:variable name="set1"
select="cdliste/cd[@jahr=2000]"/>
<xsl:variable name="set2"
select="cdliste/cd[interpret='Madonna']"/>
...
<xsl:for-each select="$set1[count(.|$set2) =
count($set2)]">
<xsl:value-of
select="titel"/><br/>
</xsl:for-each>
...
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