An earlier paper considered appropriate properties for abstract net components (or nodes) in the Coloured Petri Net formalism. This paper augments that earlier work in three main areas — it proposes general canonical forms for such node refinements, it identifies two other forms of refinement which will be used in concert with node refinement, and it considers the compositionality of these refinements. All of them maintain behavioural compatibility between refined and abstract nets, which is captured by the notion of a system morphism.