Subject: Re: [EAI] help to define Ucharacter and sub-domain by ABNF

From: Chris Newman <[email-masked]>
Date: Fri, 28 Apr 2006 19:31:18 -0700

This ABNF should work:

  Ucharacter = atext / UTF8-2 / UTF8-3 / UTF8-4

Where "atext" is defined in RFC 2822 and UTF8-2, UTF8-3, UTF8-4 are defined in 
RFC 3629.

                - Chris

YAO Jiankang wrote on 4/28/06 11:14 +0800:

>
> Dear all,
>
>     Could some kind experts help to refine the below definition of Ucharacter
> and sub-domain by ABNF in the IMA SMTP extension document?
>    It seems  not easy to find a very good appropriate definition.
>
>   thanks a lot.
>
>
> --------------------------------------------------------------------------
>
>  According to the description above, define the syntax of an IMA
>    mailbox with ABNF [RFC4234] as
>
>
>          Mailbox = Local-part "@" Domain
>
>          Local-part = Dot-string / Quoted-string
>                ; MAY be case-sensitive
>
>          Dot-string = Atom *("." Atom)
>
>          Atom = 1*Ucharacter
>          Ucharacter = <any UNICODE character,
>              except ASCII characters that are not permitted in "atext" and
> characters that can not pass Stringprep>
>
>          Quoted-string = DQUOTE *qcontent DQUOTE
>
>          Domain = (sub-domain 1*("." sub-domain)) / address-literal
>          sub-domain = Let-dig [Ldh-str] /
>              <any internationalized domain label specified by IDNA>
>
>
> YAO Jiankang
> Best Regards
> Tel:86-10-58813007
> Fax:86-10-62559892
> --------------------------------------------------
> China Internet Network Information Center (CNNIC)
> 4, South 4th Street, Zhongguancun,
> Haidian district,
> Beijing 100080, China
> POB: Beijing 349, Branch 6
> http://www.cnnic.cn
> Email: [email-masked]
> [email-masked]
>

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