[EAI] NFKC VS NFC Re: Localpart normalization

IMO:

The difference between NFKC and NFC is similar to the difference between 
IDNA2003 and IDNA2008.

the princeple of NFKC (idna2003) is to eliminate some characters (some 
characters will be invalid);
the princeple of NFC (idna2008) is to make more characters to be valid;

The answer to whether we should use NFKC or NFC is same to the answer to 
whether we should use idna 2003 or idna 2008.

Jiankang Yao

----- Original Message ----- 
From: "John C Klensin" <klensin@jck.com>
To: "Arnt Gulbrandsen" <arnt@gulbrandsen.priv.no>; <ima@ietf.org>
Sent: Friday, March 19, 2010 5:58 PM
Subject: Re: [EAI] Localpart normalization (was Re: Downgrade Design Team 
Discussion Results Released)

>
>
> --On Friday, 19 March, 2010 10:03 +0100 Arnt Gulbrandsen
> <arnt@gulbrandsen.priv.no> wrote:
>
>> I don't think that makes NFKC very dangerous for email
>> addresses. I think it bows to the inevitable.
>
> Actually, if one is going to do internationalization properly,
> one of the most often-cited goals is to permit people to spell
> their names correctly.   Since many mailbox local parts reflect
> personal names, that principle applies to them too.   And NFKC
> eliminates a lot of characters that are needed to correctly
> spell names.
>
>    john
>
>
>
>
>
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