@prefix rdf: . @prefix http-voc: . _:vb436354 rdf:type http-voc:MessageHeader . @prefix pwdr: . @prefix ns3: . _:vb436354 pwdr:describedby ns3:sparql . @prefix ns4: . _:vb436354 pwdr:describedby ns4:sparql , . @prefix ns5: . _:vb436354 pwdr:describedby ns5:sparql . @prefix ns6: . _:vb436354 http-voc:fieldName ns6:user-agent ; http-voc:fieldValue _:vb436834 . _:vb436834 rdf:type http-voc:HeaderElement ; pwdr:describedby ns5:sparql , ns3:sparql , ns4:sparql , ; http-voc:elementName "OpenLink Virtuoso RDF crawler" .