Hi, I just want to have your view on the following point. The prototype model has some different qualities than the class model and I do not want to dicuss this point here.

For my an object in prototype and class based language is has an identity that refers to a Private non sharable set of data and a sharable set of behavior (via inheirtance or delegation).

I just want to stress that what was a source of problem in some prototype models was the sharing of value between prototypes i.e. the fact that if I'm a prototype a that refers to my parents I shared their slots and so if I modified one my slot my parents are modified too.

(Note that here I'm discussing if self does or not implement maps, trait and so other implmentation techniques that are certainly valuable.)

For me the sharing of values is not good thing, it introduce to manage the split of object problem (see oospsla papers).

I prefer to see a prototype like an object having its private data and sharing its behavior.

This is the semantics of Pico developed by Pr. D'hondt from VUB http://dinf.vub.ac.be/prog/pico/

Stef