About: http://webisa.webdatacommons.org/456436460

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	In oop, such as java, we can only downcast a super class into subclass when the type actually is the subclass.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com