About: http://webisa.webdatacommons.org/29345181

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	I do not have experience with graphs and built-in functions related to them, but maybe something based on fact that the following is a Tautology:
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com