_:vb54657	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#HeaderElement> .
_:vb54657	<http://www.w3.org/2006/http#elementName>	"public, max-age=1800, must-revalidate, proxy-revalidate" .
_:vb54656	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2006/http#MessageHeader> .
_:vb54656	<http://www.w3.org/2006/http#fieldName>	<http://www.w3.org/2006/http-header#cache-control> .
_:vb54656	<http://www.w3.org/2006/http#fieldValue>	_:vb54657 .