Coloured Petri Nets Refinements

Coloured Petri nets allow for modelling complex concurrent systems, but the specification of such systems remains a challenging task. Two approaches are generally used to lessen these difficulties: decomposition and refinement. Charles Lakos proposed three kinds of refinements for coloured Petri nets: type refinement, subnet refinement, and node (place or transition) refinement. This paper proposes new rules widening the scope of both type and transition refinements.