About: http://webisa.webdatacommons.org/326205302

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	substantially equal to 270 degrees or 450 degrees, or more generally, by an angle substantially equal to [90+(N) (180)] degrees, where N is a positive integer.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com