AW: Sharp-S and Final Sigma Consensus Call Results

"Martin J. Dürst" duerst at
Thu Dec 10 07:37:34 CET 2009

Hello John, others,

I agree with half of Shawn, namely that this should be a MUST NOT.

The reason is that there have been many people on this list that say 
that this is a really bad idea, but on the other hand, there have been
serious proposals (read TRs) to just do that.

Regards,    Martin.

On 2009/12/10 6:18, John C Klensin wrote:
> --On Wednesday, December 09, 2009 21:40 +0100 Alexander
> Mayrhofer<alexander.mayrhofer at>  wrote:
>>>> I am supporting PVALID for both Sharp-S and Final Sigma,
>>>> given that mapping of PVALID characters is disallowed.
>>> Mapping of PVALID characters is *not* disallowed in
>>> draft-ietf-idnabis-mappings-05.
>> I understand. An i don't think draft-ietf-idnabis-mappings
>> should be the place where mapping of PVALID characters should
>> be disallowed - it's an Informational document.
>> The rule would need to be in one of the Standards Track
>> documents.
> Since I'm trying to look at text this afternoon and evening, is
> there agreement that it would be wise to add a "SHOULD NOT
> change the interpretation of valid strings by mapping PVALID
> characters to anything else" to the portion of Protocol where
> mapping is mentioned, or should (sic) I leave well enough alone?
> If the former, is that a correct statement of the proposition?
> Note that such a statement would make Sharp-S to "ss" mapping
> not-fully-conformant to IDNA2008, even though "SHOULD" does
> leave an opening...
> Vint?
>      john
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#-# Martin J. Dürst, Professor, Aoyama Gakuin University
#-#   mailto:duerst at

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