idnabis-defs-10: R-LDH labels that are not prefixed with "xn--"

Vint Cerf vint at google.com
Sun Aug 30 20:21:35 CEST 2009


yes this is essential. We have reserved all prefixes of the form "$ 
$--" where "$$" means any lower or upper case alpha in the range A-Z  
in ascii encoded form.

we have to do this so as to assure that there will be room for new  
prefixes if they are required.

vint



On Aug 30, 2009, at 2:02 PM, Wil Tan wrote:

> Dear IDNAbis WG members,
>
> First, my apologies for having not noticed or raised this earlier.
>
> In idnabis-defs-10 section 2.3.1 paragraph 5:
>
>    Labels within the class of R-LDH labels that are not prefixed with
>    "xn--" are also not valid IDNA-labels.  To allow for future use of
>    mechanisms similar to IDNA, those labels MUST NOT be processed as
>    ordinary LDH-labels by IDNA-conforming programs and SHOULD NOT be
>    mixed with IDNA-labels in the same zone.
>
> I may have missed it, but don't recall any discussions about  
> restricting the processing of other tagged domains. Is this the  
> right draft to prescribe restrictions on how non-XN-Labels are  
> processed?
>
> =wil
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