I do have the following Problem.
You didn't say whether it is an XSLT problem or an Xpath problem
I'll assume XSLt as that's a bit easier.
If the current node is DDD
<xsl:variable name="ddd" select="."/>
<xsl:for-each select="../AAA/BBB/*">
<xsl:variable name="n" select="name()"/>
<xsl:if test="not($ddd/*[name()=$n])">
<xsl:copy-of select="."/>
</xsl:if>
</xsl:for-each>
David
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