_:vb57091	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#MessageHeader> .
_:vb57091	<http://www.w3.org/2006/http#fieldValue>	_:vb57092 .
_:vb57092	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#HeaderElement> .
_:vb57092	<http://www.w3.org/2006/http#elementName>	"OpenLink Virtuoso RDF crawler" .
_:vb57091	<http://www.w3.org/2006/http#fieldName>	<http://www.w3.org/2006/http-header#user-agent> .