_:vb91883	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#MessageHeader> .
_:vb91884	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#HeaderElement> .
_:vb91883	<http://www.w3.org/2006/http#fieldName>	<http://www.w3.org/2006/http-header#user-agent> .
_:vb91883	<http://www.w3.org/2006/http#fieldValue>	_:vb91884 .
_:vb91884	<http://www.w3.org/2006/http#elementName>	"OpenLink Virtuoso RDF crawler" .