PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • (Aaronaught argues that this means a Nullable can not really contain null, while I disagree because at the level at which it uses it can have a semantic null, his point is worth considering in that even when null a Nullable is different to a reference - really our disagreement is a matter of which level of abstraction we choose to use).
http://www.w3.org/ns/prov#wasQuotedFrom
  • stackoverflow.com