About: http://webisa.webdatacommons.org/442807607

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	But I think the best answer to your question is probably 2012 before we are in a position to really use that in that way.
http://www.w3.org/ns/prov#wasQuotedFrom	seekingalpha.com