“…These years, the objectoriented formal methods such as object Petri nets (OPN) (Bastide, 1995), VDM++ (Harel & Gery , 1996), Object-Z (Schuman, 1997), etc are suggested. Among the studies, the research on OPN has been focused on the extending Petri net formalism to OPN such as HOONet (Hong & Bae, 2000), OBJSA (Battiston et al 1988), COOPN/2 (Biberstein & Buchs, 1994) and LOOPN++ (Lakos & Keen, 1994), which are suggested on the base of colored Petri Net (CPN) (Jensen, 1992). Object-oriented Petri net (OPN) can model different systems easily, intuitively and naturally.…”