About: http://webisa.webdatacommons.org/213425911

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	17:23:04 [ivan]alistair: applications might want the integrity of their data, and expressing the constraints is a requirement
http://www.w3.org/ns/prov#wasQuotedFrom	w3.org