About: http://webisa.webdatacommons.org/116702350

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	When the medium at both sides of the lens is the same, for example air, the nodes coincide with the main points A and B of the projections lens.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca