About: http://webisa.webdatacommons.org/308221471

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	The idea is that for a simple shape such as a rectangle, one can define some auxiliary nodes whose boundary coincides with the boundary of the original node when seen from certain directions but which are centred at the correct place.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com