Label separators (was: Re: Urdu and SPACE, FULL STOP (Re: comments on IDNAbis: draft-faltstrom-idnabis-tables-04.txt Arabic))

[YAO Jiankang]

----- Original Message ----- 
From: "John C Klensin" <klensin at jck.com>
To: "Sarmad Hussain" <sarmad.hussain at nu.edu.pk>
Cc: <idna-update at alvestrand.no>
Sent: Sunday, February 24, 2008 1:15 AM
Subject: Label separators (was: Re: Urdu and SPACE, FULL STOP (Re: comments on IDNAbis: draft-faltstrom-idnabis-tables-04.txt Arabic))


...
> The IDNA200X version is equivalent to "the only valid label
> separator on the wire or in interchange is ASCII period.
> However, since we have prohibited all other punctuation
> characters (other than hyphen) from ever actually appearing in a
> domain name, if you need to use a convention locally to permit
> easier typing of that character, you can substitute any
> convenient punctuation (or other disallowed) character for it...

if future  IDNA200X version does not allow other label separator except the ASCII period, the IDNA application such as IE browser would not support other label separator and would  regard these separators as illegal ones.

you said "if you need to use a convention locally to permit
 easier typing of that character, you can substitute any
convenient punctuation (or other disallowed) character for it...",
I am a little afraid of how we can do it without the support of IDNA200X version ? 
 Install some plug in to translate these separators into ASCII period 
before we store them in a file or transmit them on the wire?


YAO Jiankang
CNNIC


> as long as it is mapped to ASCII period before you store it in a
> file or transmit it on the wire".
> 
> That is clearly not a perfect solution, but it gives you the
> flexibility you need while preserving both global
> interoperability and the ability for non-IDNA applications to
> unambiguously parse domain names into labels.
> 
>    john
> 
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