PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • An ???A-plate??? is an optical retarder utilizing a layer of uniaxially birefringent material with its extraordinary axis oriented parallel to the plane of the layer, and its ordinary axis (also called ???a-axis???) oriented perpendicular to the plane of the layer, i.e. parallel to the direction of normally incident light.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com