About: http://webisa.webdatacommons.org/428452000

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	A.SomeEvent += new Action<A>(x => ...).In your event handler, you want to perform operations on 'x', but you need to know whether x is a B or a C, and A does not implement the visitor pattern.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com