> From: Peter Donald [mailto:[EMAIL PROTECTED]] 
>
> > But how do you express the requirement of requestShutdown ()?
> 
> Because the type has that method. ie
> 
> interface BlockContext
> {
>   ...
>   void requestShutdown();
>   ...
> }
> 
> So anything that requires that type implicitly requires the method.

OK, but then our ideas are equivalent. (Just had to point that out.)

/LS


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