PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Mathematics of Perspective Drawing: a detailed, illustrated guide to the mathematics behind perspective drawing, covering such topics as how to use vanishing points, one- and two-point perspective, parallel transformation of points, perspective projections, projective geometry, rotation of vectors, the perspective drawing of a circle, computer graphics and more.
http://www.w3.org/ns/prov#wasQuotedFrom
  • teachersnetwork.org