Re: SHOULD vs MUST

[Fred Baker <fred at cisco.com>]

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.
_______________________________________________
IETF mailing list
IETF at ietf.org
https://www.ietf.org/mailman/listinfo/ietf