About: http://webisa.webdatacommons.org/217160918

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	Some other languages, such as C#, that do not have truthiness, have a null-coalescing operator[MSDN] that has a similar purpose.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com