PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • However, difficulties in implementation, in particular in connection with providing for the necessary high frequency on and off switching of the source tube, prevented this type of system from attaining widespread usage.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com