PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The term Presidential historical materials (also referred to as historical materials and materials) shall mean all papers, correspondence, documents, pamphlets, books, photographs, films, motion pictures, sound and video recordings, machine-readable media, plats, maps, models, pictures, works of art, and other objects or materials made or received by former President Richard M. Nixon or by members
http://www.w3.org/ns/prov#wasQuotedFrom
  • ecfr.gov