About: http://webisa.webdatacommons.org/198241253

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	As I said in my question, object was a possible solution, but not one I liked because of casting.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com