About: http://webisa.webdatacommons.org/157857411

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	Basically: if you do not like unchecked casting, you will have to supply implementation types to all methods.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com