Damien <Damien.Pous@ens-lyon.fr> writes:

> Hello,
> 
> I would like to create two mutually recursive classes,
> parents (a) and children (b)
> 
> Furthermore, I'd like to define them incrementally
> parents and children,
> parents and children with hands
> parents and children with hands and feet

It looks similar to the subject/observer pattern.  Check Section 5.3 of the
OCaml manual as well as my APPSEM course notes
http://cristal.inria.fr/~remy/cours/appsem/ocaml-objects.html

        Didier


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