[news.eclipse.modeling.mdt.ocl] Re: def expression?

[Ed Willink <ed@xxxxxxxxxxxxx>]

Hi Joel
> > I'm not sure about your whole problem but when you mention removing 
> > variables from environments I get very uncomfortable. 
>
> Why is that?

It means that the Environment has a very clear locality. Nested 
environments are always valid for the context that initialised them.

Note that OCL 2.0 does not support remove of elements from an Environment.
> > It is much easier
> > to created a nested environment for the nested scope and revert to the
> > outer ebvironment when you want to recover context.

You'll find nested environments are easy too, and you cannot forget to 
match your adds with removes.
> I haven't worked with these nested environments yet, but I'll keep it in 
> mind. However, I'd have to create a nested environment for each variable 
> that I add. Adding and removing variables is easy and works well for me 
> so far.

If it works for you fine. Just beware that if you start to do more 
interesting things, it might bite later.

	Regards

		Ed Willink