About: http://webisa.webdatacommons.org/166091185

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	The undefined value, when allowed on a state or property, is an explicit indication that the state or property is not set.
http://www.w3.org/ns/prov#wasQuotedFrom	w3.org