<http://papyri.info/hgv/21106/source> <http://xmlns.com/foaf/0.1/page> <http://papyri.info/ddbdp/p.heid;4;321> .
<http://papyri.info/ddbdp/p.heid;4;321/source> <http://xmlns.com/foaf/0.1/page> <http://papyri.info/ddbdp/p.heid;4;321> .
<http://papyri.info/ddbdp/p.heid;4;321> <http://xmlns.com/foaf/0.1/topic> <http://papyri.info/hgv/21106/source> .
<http://papyri.info/ddbdp/p.heid;4;321> <http://xmlns.com/foaf/0.1/topic> <http://papyri.info/ddbdp/p.heid;4;321/source> .