state machin build state machin object context context model impl state machin helper ad statemachin allow context state machin machin creat state machin model element context model element context machin set context context context classifi machin set namespac classifi context context behavior featur behavior featur featur behavior featur context machin set namespac featur owner state build composit state state machin machin equal machin machin illeg argument except build state machin context legal 