_:vb50396573 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> <http://www.w3.org/2006/http-header#subst> . <http://www.w3.org/2006/http-header#subst> <http://www.w3.org/2000/01/rdf-schema#label> "Subst"@en . <http://www.w3.org/2006/http-header> <http://xmlns.com/foaf/0.1/topic> <http://www.w3.org/2006/http-header#subst> . <http://www.w3.org/2006/http-header#subst> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#Thing> . _:vb50811387 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> <http://www.w3.org/2006/http-header#subst> . <http://www.w3.org/2006/http-header#subst> <http://www.w3.org/2007/05/powder-s#describedby> <http://demo.openlinksw.com/about/id/entity/http/www.w3.org/2006/http-header> . <http://www.w3.org/2006/http-header#subst> <http://www.w3.org/2000/01/rdf-schema#comment> "The Subst header"@en .