About: http://webisa.webdatacommons.org/174457948

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 a value is returned but the value is a database null it will return BDNull.value, which will also fail because it can not be cast to an int32.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com