About: http://webisa.webdatacommons.org/250982149

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	A corner is a triple of the form , where can be a set plus an anti-set (an antiset is like a set where every element has a multiplicity of -1).
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com