About: http://webisa.webdatacommons.org/3374804

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	If 2 or 3 are yes, I think I would do two fields and some kind of crazy parser to determine what is extension or other data and deal with it appropriately.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com