import models/SimpleClassDiagrams as SCD
include "primitives.alh"

SCD PetriNets{
    Class Natural {
        $
            if (bool_not(is_physical_int(self))):
                return "Natural has no integer value"
            elif (integer_lt(self, 0)):
                return "Natural does not have a positive or zero value"
            else:
                return "OK"
         $
    }
    Class Place{
        tokens : Natural
    }
    Class Transition{}
    Association P2T (Place, Transition) {
        weight : Natural
    }
    Association T2P (Transition, Place) {
        weight : Natural
    }
}

export PetriNets to models/PetriNets