About: http://webisa.webdatacommons.org/5405040

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	Rolling your own is fine but looking at these systems is a place to start.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com