About: http://webisa.webdatacommons.org/126500647

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	You are missing something, which I would say is the best approach if you want to go down this route:
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com