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Re: [BEHAVE] RFC3489bis-07 now available

Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Wed, 18 July 2007 06:46 UTC

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From: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Organization: Nokia TP-SP-SWD
To: ext Philip Matthews <philip_matthews@magma.ca>, Behave WG <behave@ietf.org>, ext Jonathan Rosenberg <jdrosen@cisco.com>, Dan Wing <dwing@cisco.com>
Subject: Re: [BEHAVE] RFC3489bis-07 now available
Date: Wed, 18 Jul 2007 09:45:45 +0300
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On Tuesday 17 July 2007 21:24:30 you wrote:
> >> * defined length limits on all free-form fields
> >
> > That's really appreciable! But but, the limit should most likely be
> > expressed
> > in bytes rather than in characters. Otherwise, it is pretty
> > ambiguous whether
> > the limit is in code points or bytes.
>
> I don't  really see this.
> For the username, it says
>     It MUST contain a
>     UTF-8 encoded sequence of less than 128 characters.
> How is this ambiguous?

To re-iterate the question, does "character" mean "code point" or "byte"? It 
is totally ambiguous.

To me, a UTF-8 encoded sequence of less than 128 characters is up to 
(128-1)*6+1=763 bytes, counting the terminating nul (and that's a bit big, 
IMHO). To most implementors it's going to be 127(+1) bytes.

I would much rather have:

	It MUST contain a valid UTF-8 encoded sequence of less than 128 bytes.

-- 
Rémi Denis-Courmont


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