About: http://webisa.webdatacommons.org/178812518

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	What you describe in your question is a very common pattern, therefore many solutions already exist around the idea of just setting a special HTTP header, then letting the Web stack below your application deal with it efficiently.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com