About: http://webisa.webdatacommons.org/208591233

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	There may be other cases involving generics where is is useful (because you may not know whether T is a reference type or not, so you can not use as) but they are relatively obscure.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com