_:vb51197727 . _:vb51197727 . _:vb51197727 . _:vb51197727 . _:vb51197727 "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." . _:vb51197727 .