About: http://webisa.webdatacommons.org/437887421

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	AFAIK, the only solution that guarantees that it catches all dereferences of null at compile time is a solution that disallows a pointer/reference from ever being null in the first place.
http://www.w3.org/ns/prov#wasQuotedFrom	digitalmars.com