PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In computer science, reference counting is a technique of storing the number of references, pointers, or handles to a resource such as an object or block of memory.
http://www.w3.org/ns/prov#wasQuotedFrom
  • reference.com