About: http://webisa.webdatacommons.org/6612944

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	Another way to look at this is to ask where do you want to return the probability of the vertex, and what do you do if the object you have at that point is a Vertex rather than a PrVertex?
http://www.w3.org/ns/prov#wasQuotedFrom	codeguru.com