Final Sigma (was: RE: Esszett, Final Sigma, ZWJ and ZWNJ)

JFC Morfin jefsey at
Mon Mar 2 17:17:54 CET 2009

2009/3/2 Erik van der Poel <erikv at>

> On Mon, Mar 2, 2009 at 5:30 AM, JFC Morfin <jefsey at> wrote:
> > 2009/3/1 Erik van der Poel <erikv at>
> >> Eszett, ZWJ and ZWNJ should not be
> >> placed in the xn-- space. They should receive a different prefix. The
> >> local mappers should try both (e.g. Eszett with new prefix, and ss
> >> with or without xn--, depending on the rest of the string).
> >
> > And what if you have Eszett and ZWJ in the same label?
> Some registries might disallow Eszett and ZWJ in the same label, and
> IDNA2008 might not allow Eszett and ZWJ to be adjacent due to
> contextual rules for ZWJ, but they could receive the same prefix, say,
> xo--.
> >> And if the French really want to distinguish ecole and Ecole, they
> >> will not only need a different prefix, but also something other than
> >> Punycode (as far as I can tell).
> >
> > really?
> > why?
> The current DNS does not allow and to resolve to
> different IP addresses. So you will have to encode these somehow. This
> means that you need a prefix. You cannot use xn-- because that is for
> Punycode. You cannot use Punycode because it does not encode ASCII. It
> just copies the ASCII characters directly into the output. For
> example, français is encoded as franais-xxa. Note the directly copied
> ASCII characters "franais". Appendix A of Punycode (RFC 3492) allows
> you to encode upper/lower case. So you might have,
> but this would resolve to the same IP address as
> So you need something other than Punycode that does not copy ASCII
> characters directly to the output.
> Erik

No. If I include bigtitles as TEMPORARY (cf. my other suggestion),
"Français" would become "" but "français" would be "".
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