Tables and contextual rule for Katakana middle dot

Patrik Fältström patrik at
Sun Apr 5 17:00:19 CEST 2009

On 4 apr 2009, at 05.31, John C Klensin wrote:

> Just so this doesn't accidentally fall through the cracks...

Thanks for that. Myself, like many others, have a backlog after every  
IETF. A backlog I try to catch up with.

FWIW: I am working on an implementation similar to Mark's that he  
announced, so that we can get two implementations of everything.  
Hopefully that will make it easier to find "bugs" like these.

> It is clear from the discussion last week that I simply got the
> contextual rule for Katakana Middle Dot (U+30FB) wrong in what
> is rule/Appendix A.12 in Tables-05.  I had understood that I had
> been told it was used only with Katakana; the JET I-D and
> Monday's presentation make it clear to me (and I assume others)
> that it can be used between any pair of Japanese characters.


> The overview now reads:
>   Adjacent characters MUST be Katakana.
> It should be:
>   Adjacent characters MUST be Hiragana, Katakana, or Han.
> The associated Rule Set will, of course, have to be updated to
> match.
> Yoneya-san,
> Could you please check the above and verify that I have stated
> the rule correctly and not simply replaced one error with
> another?  Also, the Unicode table Scripts.txt lists several
> Hiragana and Katakana characters are members of the "Common"
> group rather than being script-specific.  Could you verify that
> none of those are relevant (e.g., that they are DISALLOWED or
> otherwise prohibited from appearing in domain name labels)?

Yoneya-san, this will be appreciated.


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