_:vb51099	<http://www.w3.org/2006/http#fieldName>	<http://www.w3.org/2006/http-header#expires> .
_:vb51099	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#MessageHeader> .
_:vb51100	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#HeaderElement> .
_:vb51099	<http://www.w3.org/2006/http#fieldValue>	_:vb51100 .
_:vb51100	<http://www.w3.org/2006/http#elementName>	"Thu, 19 Nov 1981 08:52:00 GMT" .