@prefix rdf: . @prefix http-voc: . _:vb186428 rdf:type http-voc:HeaderElement . @prefix pwdr: . @prefix ns3: . _:vb186428 pwdr:describedby ns3:sparql . @prefix ns4: . _:vb186428 pwdr:describedby ns4:sparql . @prefix ns5: . _:vb186428 pwdr:describedby ns5:c090a590eb1825d3e4c94ce20c1baab24337b306 . @prefix ns6: . _:vb186428 pwdr:describedby ns6:sparql ; http-voc:elementName "OpenLink Virtuoso RDF crawler" .