About: http://webisa.webdatacommons.org/231673040

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 think this is all you can do to be safe and not to exclude valid files; although I have heard of hashing the file, and some other options; but these will most defiantly exclude legit files.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com