PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In C and other languages, checks of empty values are always needed to check parameters and user inputs INDEPENDENT of datatypes: e.g. to use defaults, avoid runtime errors, avoid further checks and so on.
http://www.w3.org/ns/prov#wasQuotedFrom
  • rebol.com