Casefolding Sigma (was: Re: IDNAbis Preprocessing Draft)

Mark Davis mark.davis at
Mon Jan 28 21:13:04 CET 2008

Yes, I think that would be useful.


On Jan 29, 2008 12:55 AM, Michel Suignard
<michelsu at> wrote:
> John,
> > From: John C Klensin
> >
> >>--On Saturday, 26 January, 2008 18:57 +0900 Martin Duerst
> >><duerst at> wrote:
> >
> >
> >> Are such short codes being considered at all? In parallel
> >> with full names? Or did you mean that Cypros is looking
> >> at getting the equivalent of Cs in Greek for their TLD?
> >
> >Or the equivalent of Cypros in Greek characters for their
> >TLD. If you want to get seriously depressed (or amused,
> >depending...) you should examine the range of proposals for
> >IDN TLD names and how to formulate them that have been
> >circulated around ICANN.
> Having written one of these proposals, I beg to disagree somehow. Using the iana list of the active cctlds, I took the country names in their native writing systems and was reasonably successful. The issues I had were:
> - lack of capital forms, but that is inherent of the lowercase bias taken by IDN,
> - Cyprus, issue of the ending sigma, which has been discussed a lot here
> - Maldives, because it ends with a combining mark
> - Sri Lanka, needs ZWJ to be correctly represented,
> - Myanmar, imperfect representation with Unicode 3.2 and therefore IDNA2003
> Except for the Cyprus case, it is my understanding that the work as currently proposed in the new IDN200x would fix these issues.
> Michel
> PS I can post my document publicly if there is interest in this list.
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