PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Haskell solves much of the need for exceptions using returns that symbolize failures, e.g. Maybe and Either, and the use of Monad eliminates the need to check the results at each step.
http://www.w3.org/ns/prov#wasQuotedFrom
  • tnegri.com