Integration of BIDI into the protocol

Vint Cerf vint at
Tue Sep 1 04:58:20 CEST 2009


I think your first formulation is the more general. You will recall  
that we explicitly chose not to introduce inter-label BIDI testing.


On Aug 31, 2009, at 9:33 PM, James Mitchell wrote:

>>> As a registry, should I allow registration of the name 123abc.RTL?
>> My recommendation is that you should (as a registry) establish policy
>> that says "it is not allowed". The protocol does not require you to  
>> do so.
>>> As an application, should I lookup the name 123abc.RTL?
>> The protocol does not say that you can't. For the obvious reasons, I
>> think it's a legitimate implementor decision to decide not to.
> I was of the assumption that the lookup protocol was no more  
> restrictive than the registration protocol.
> I propose that one of the following changes is made to draft-ietf- 
> idnabis-protocol-14.  The first to clarify that registries are  
> expected to establish policy for this specific issue (or potentially  
> be suprised if they do not), and the second to prevent such labels  
> entirely.  I am leaning towards the latter only because the protocol  
> states such names SHOULD be rejected in lookup.
>  Labels Containing Characters Written Right to Left
>   If the proposed label contains any characters that are written from
>   right to left it MUST meet the BIDI criteria [IDNA2008-BIDI].
>   Note that a label containing no characters written from right to  
> left
>   may fail to meet the BIDI criteria when in a name having at least  
> one
>   label containing right to left characters.  It is expected that
>   registries establish policy for the registration of such labels.
> or
>   If the proposed label, or the name in which it belongs, contains any
>   characters that are written from right to left then the proposed  
> label
>   MUST meet the BIDI criteria.
> I welcome any updates to the wording of these changes.
> James
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