About: http://webisa.webdatacommons.org/356591633

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	Regarding an RDBMS solution to your problem, here are the most common approaches that I have seen:
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com