About: http://webisa.webdatacommons.org/203553985

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	Therefore (null is T), where T is a reference type should return true.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com