About: http://webisa.webdatacommons.org/405683453

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	When you up-cast from Derived to Base, you are telling the compiler that as far as you and it know, the thing pointed to is a Base.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com