Hanb in domain labels

[Bill Poser]

The use of bopomofo in Chinese is not parallel to the use of kana in
Japanese. Whereas kana are routinely mixed with kanji in Japanese, with,
e.g., a verb stem written in kanji and the suffixes written in kana, and
Japanese can be written entirely in kana (e.g. by young children), bopomofo
does not appear in ordinary Chinese text. It is an ancillary system, used,
e.g., to give the pronunciation of Chinese characters and is a commonly
available input method. That doesn't guarantee that it doesn't occur in
email addresses, though I don't recall seeing it. I'm not sure if it is
even permitted in the legal name of a company.

On Fri, Aug 16, 2024 at 7:32 AM Martin J. Dürst via Unicode <
unicode at corp.unicode.org> wrote:

> Hello Henri,
>
> I don't know about Chinese and Bopomofo, but for Japanese, there surely
> are e.g. company names that contain both Kana and Kanji. And company
> names are one (although of course not the only) use case for domain names.
>
> I'm cc'ing Arnt, who is one of the authors of
>
> https://www.ietf.org/archive/id/draft-gulbrandsen-smtputf8-nice-addresses-00.html,
>
> which is about email addresses (quite a bit related to domain names) and
> discusses Chinese quite a bit (although it doesn't mention Bopomofo).
>
> Regards,   Martin.
>
> P.S.: draft-gulbrandsen-smtputf8-nice-addresses-00.html is in my view
> still in a very early stage; I have read through it but still have to
> write up my comments.
>
> On 2024-08-15 18:08, Henri Sivonen via Unicode wrote:
> > UTS #39 is commonly used as the baseline for detecting IDN spoofs, and
> UTS
> > #39 explicitly allows combining Han and Bopomofo. Considering that ㄚ
> looks
> > confusable with 丫 and ㄠ looks confusable with 幺, I’m wondering if it’s
> > appropriate to explicitly allow this combination in the spoof detection
> > context. Is combining Han and Bopomofo in one domain label something that
> > occurs commonly enough in domains that aren’t intended to be spoofs for
> it
> > being necessary not to treat the script combination as triggering spoof
> > detection in the domain name context?
> >
>
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