About: http://webisa.webdatacommons.org/436295583

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	I had a look recently for the sort of thing you describe -- either a general data cache, or an image centric one -- and didn't find much of interest.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com