@prefix rdf: . @prefix http-voc: . _:vb71669 rdf:type http-voc:MessageHeader . @prefix pwdr: . _:vb71669 pwdr:describedby . @prefix ns3: . _:vb71669 pwdr:describedby ns3:sparql . @prefix ns4: . _:vb71669 pwdr:describedby ns4:sparql . @prefix ns5: . _:vb71669 pwdr:describedby ns5:sparql . @prefix ns6: . _:vb71669 http-voc:fieldName ns6:user-agent ; http-voc:fieldValue _:vb72149 . _:vb72149 rdf:type http-voc:HeaderElement ; pwdr:describedby , ns4:sparql , ns3:sparql , ns5:sparql ; http-voc:elementName "OpenLink Virtuoso RDF crawler" .