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From: Beman Dawes (beman_at_[hidden])
Date: 2000-08-30 07:14:29

John Maddock wrote:

>>I thought about this, and I think it doesn't quite have the meaning we
>want. I think the above means you can have a mutex component that
>supports both ceiling and inherited, but not necessarily be able to
>turn them both "on" at the same time.
>Isn't + an inclusive OR and | an exclusive OR? I've only just started
>reading the book and I haven't got that far yet, but that was my reading
>Beman's synopsis.

Yes, that is correct.

(a|b|c) means "one of" a, b, or c.
(a+b+c) means "one or more of" a, b, or c.
[a|b|c] means "zero or one of" a, b, or c.
[a+b+c] means "zero or more of" a, b, or c.

I choose | as the exclusive OR symbol because that is the traditional usage
for describing options.

I choose + as the inclusive OR symbol because it seemed to denote "more"
better that several other symbols I tried.


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