About: http://webisa.webdatacommons.org/157378435

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	It is not necessary, but these warning are a hit to you that you might have got the signature wrong in the extending class, forgot to implement the method at all in the super class, or some other silly mistake.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com