[Gen-art] LC review: draft-ietf-idnabis-bidi-06.txt

"Martin J. Dürst" duerst at it.aoyama.ac.jp
Tue Oct 6 03:11:40 CEST 2009

I agree with what Ken has said below, for domain names. However, the 
Bidi document and its rules may be of value to the IETF and others in 
other contexts. In particular, I'm thinking about IRIs. For such cases, 
it is much better if CS stays as allowed, because IRIs might allow some 
CS characters in some places.

Regards,   Martin.

On 2009/10/06 5:14, Kenneth Whistler wrote:
> Erik said:
>> Yes, this change occurred between bidi draft versions 3 and 4, and is
>> due to Mati's proposal. I believe he came up with that suggestion
>> based purely on the bidi criteria (grouping, uniqueness), and not
>> based on what was allowed/disallowed in the Table draft.
> Then I think the editor needs to address that more explicitly,
> particularly at the point in Section 2 that says what bidi classes
> are allowed in labels, so as not to lead to exactly the kind
> of misreading and confusion that Joel Halpern has indicated.
>> I think it's OK to leave CS in there, even if the Table spec excludes
>> all of them in the current version of Unicode. Future versions of
>> Unicode might introduce new CS characters that we want to allow in
>> IDNs, though that seems unlikely.
> Exceedingly unlikely. Astronomically unlikely. There is a
> reason why bc=CS is actually Bidi_Class=Common_Separator,
> as in characters that *separate* numeric parts and other
> label-like things.
> No character will be added to Bidi_Class=Common_Separator
> in the future unless it is another punctuation analog (and
> mostly likely even a compatibility equivalent to) a FULL STOP,
> I can't even conceive of the circumstances under which the IETF
> would decide it would be a good idea to add a newly encoded
> one of those into the allowed set of characters for IDNs
> in the future.
> --Ken
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#-# Martin J. Dürst, Professor, Aoyama Gakuin University
#-# http://www.sw.it.aoyama.ac.jp   mailto:duerst at it.aoyama.ac.jp

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