Changing the xn-- prefix

YAO Jiankang yaojk at
Tue Mar 25 07:29:11 CET 2008

----- Original Message ----- 
From: "Patrik Fältström" <patrik at>
To: "Shawn Steele" <Shawn.Steele at>
Cc: <idna-update at>; "John C Klensin" <klensin at>; "Mark Davis" <mark.davis at>
Sent: Tuesday, March 25, 2008 10:23 AM
Subject: Re: Changing the xn-- prefix

> On 25 mar 2008, at 00.13, Shawn Steele wrote:
>> I reread your original mail, and in particular I don't want to get  
>> bogged down in the debate of details while trying to set the  
>> guidelines, but I'd like to try for "A prefix change MUST be  
>> avoided" (removing the condition).  If that's going to cause too  
>> much randomization, then I'd back down, but the repercussions of  
>> changing the prefix are huge.
> I am personally in favor of text in the charter that say "The prefix  
> xn-- MUST NOT be changed." where MUST NOT is defined according to the  
> IETF definition in RFC 2119 (  


> This put a constrain on the changes the wg is allowed to do to  
> IDNA200X (not large so that the prefix has to change) -- at least not  
> without rechartering.
>    Patrik
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