<joins>
<join>
<condition>//tei:correspAction[@type='received']/tei:persName/@ref</condition>
<resource uri="http://d-nb.info/gnd/{//tei:correspAction[@type='received']/tei:persName/@ref}/about/lds">
<expression>//rdf:RDF/*</expression>
<join>
<condition>{//foaf:page}</condition>
<resource uri="{//foaf:page/@rdf:resource}">
<expression>//rdf:RDF/*</expression>
</resource>
</join>
<join>
<condition></condition>
<resource uri="{//owl:sameAs/@rdf:resource[starts-with(.,'http://viaf.org/')]}.xml">
<expression>//rdf:RDF/*</expression>
</resource>
</join>
</resource>
</join>
</joins>
