On Jun 25, 2008, at 5:28 AM, Frank Ellermann wrote:
A SHOULD X unless Y essentially means "SHOULD (X or Y)"
I'd read it as "do X, but if you have a very good excuse
not doing X might do. One known very good excuse is Y."
That is more or less my definition of "should". I say something "must"
be so when I can tell you an operational failure that would or could
happen if it isn't. If I would like to say "must" but can think of a
case in which it would not be appropriate I say "should", and am
saying that if it is not so in someone's implementation they should be
prepared to say what their reason was.
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