About: http://webisa.webdatacommons.org/213516372

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	I put it there to make it clear for noobs that it is a prototype, but mostly people do not use the explicit extern declaration form these days.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com