About: http://webisa.webdatacommons.org/249998780

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	(Side remark: I think the cast (D)c, where c's runtime type is C, should be allowed if D is a C and the only difference to C are added methods.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com