something like this perhaps
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
<xsl:key name="d" match="document" use="@id"/>
<xsl:template match="/">
<people>
<xsl:copy-of
select="data/persons/person[document[not(key('d',@relid))]]/name"/>
</people>
</xsl:template>
</xsl:stylesheet>
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