> 	The ANSI standard exposes the situations in the programming
> interface. It requires a separate class for each situation, which I think
> is overkill.
> 
This is not entirely true. The only thing that ANSI actually requires is
that there are a couple of globals (e.g., MessageNotUnderstood, ZeroDivide)
that respond to the right kind of messages. Whether these are instances of a
single class or actual classes is irrelevant.

  Andreas

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