About: http://webisa.webdatacommons.org/135772459

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	That means that, at compile time, the compiler does not know whether a Base pointer is a pointer to a Base object, an A object or a B object.
http://www.w3.org/ns/prov#wasQuotedFrom	daniweb.com