About: http://webisa.webdatacommons.org/268890276

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	In other words: if there exists no node $x \in N$ which satisfies $v\cdot (x-p^*)<0$, then the line is an edge of on a face.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com