Re: [DNSOP] draft-liman-tld-names-04

[Patrik Fältström <[e-mail]>]

On 15 nov 2010, at 10.06, Masataka Ohta wrote:

> The reality is that, with ISO 8859/1, which is what you are using
> in your mails, plain 'Y' without diaeresis is used as a capital
> form of both plain 'y' without diaeresis and 'y' with diaeresis.

No, that statement is not correct. The mapping you might want depends on context, and that not only because of language, but also where the language is used. I.e. it depends on what locale you are using.

> That's the case insensistivities of the real world, regardless
> of how Unicode defines case insensitivity. Worse, localized
> domain names must but can not handle the real world issues.

And that is why case insensitivity is NOT part of IDNA2008. Instead only case folded code points are allowed.

See RFC 5895 and the RFC 5890 series IDNA2008 RFCs.

5895 Mapping Characters for Internationalized Domain Names in
     Applications (IDNA) 2008. P. Resnick, P. Hoffman. September 2010.
     (Format: TXT=16556 bytes) (Status: INFORMATIONAL)

   Patrik