@prefix rdf: . @prefix http-voc: . _:vb41536 rdf:type http-voc:MessageHeader . @prefix pwdr: . @prefix ns3: . _:vb41536 pwdr:describedby ns3:sparql , . @prefix ns4: . _:vb41536 pwdr:describedby ns4:sparql . @prefix ns5: . _:vb41536 http-voc:fieldName ns5:user-agent ; http-voc:fieldValue _:vb41666 . _:vb41666 rdf:type http-voc:HeaderElement ; pwdr:describedby ns3:sparql , , ns4:sparql ; http-voc:elementName "OpenLink Virtuoso RDF crawler" .