PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The _NUMBER function is intended to be imported into your package, and provides a convenient way to test to see if a value is a number.
http://www.w3.org/ns/prov#wasQuotedFrom
  • cpan.org