About: http://webisa.webdatacommons.org/258173915

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 it is not free, it offers an almost-fully working demo, i.e. limited in time but not in features (to be sure it actually works)
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com