About: http://webisa.webdatacommons.org/269073159

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	In other languages such as Objective-C or C#, nil/null is part of the language, even if it does essentially the same thing.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com