Re: IDNA reference

On Tue, Sep 7, 2010 at 7:41 PM, Julian Reschke <julian.reschke@gmx.de>wrote:

> Hi,
>
> <http://tools.ietf.org/html/draft-ietf-iri-3987bis-01#section-3.4>:
>
>   Replace the ireg-name part of the IRI by the part converted using the
>   ToASCII operation specified in Section 4.1 of [RFC3490] on each dot-
>   separated label, and by using U+002E (FULL STOP) as a label
>   separator, with the flag UseSTD3ASCIIRules set to FALSE, and with the
>   flag AllowUnassigned set to FALSE.  The ToASCII operation may fail,
>   but this would mean that the IRI cannot be resolved.  In such cases,
>   if the domain name conversion fails, then the entire IRI conversion
>   fails.  Processors that have no mechanism for signalling a failure
>   MAY instead substitute an otherwise invalid host name, although such
>   processing SHOULD be avoided.
>
> In August, RFC 3490 has been obsoleted by RFC 5890/91.
>
> What's the right reference for ToASCII now?
>
>
The closest thing would be sections 5.1 to 5.5 of RFC 5891, but simply
referencing them will lead to incompatibility (e.g. producing different
A-labels from the IDNA2003 version.)

http://unicode.org/reports/tr46/ details a good transition strategy, but I
wonder how one could work that into iri-bis.

.wil