PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The best definition I have heard, is eight optical engineers sitting around a table arguing about how to explain it in words real people can understand.Wikipedia defines it thus:In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source.
http://www.w3.org/ns/prov#wasQuotedFrom
  • dpreview.com