_:vb50849284 . _:vb50849284 . _:vb50849284 "Derivation is a particular case of trace (see http://www.w3.org/TR/prov-dm/#term-trace), since it links an entity to another entity that contributed to its existence." . _:vb50849284 . _:vb50849284 . _:vb50849284 . _:vb50849284 .