<xsl:variable name="thisroot" select="/"/>
<xsl:variable name="thisNode"
 select="id($personid)/name/@first
           [/family-tree/@id = $persontree]
               |
        document($persontree,/)/family-tree/person[@id=$personid]/name/@first
           [not($thisroot/family-tree/@id = $persontree)]
         "/>

David

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