About: http://webisa.webdatacommons.org/187073017

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	You need to tell the compiler that Ref is a type by using typename i.e.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com