Eszett (Sharp-S) - 3 (was AW: Comments on idnabis-rationale-01)

Mark Davis mark.davis at icu-project.org
Fri Aug 8 19:24:30 CEST 2008


I can understand the desire for including ß, but I'm worried about the
compatibility and security aspects. An IDNA2003 implementation will send "
maße.com <http://masse.com>" to masse.com, while an IDNA2008 implementation
will send it to "maße.com <http://masse.com>".

Mark


On Fri, Aug 8, 2008 at 6:52 AM, John C Klensin <klensin at jck.com> wrote:

>
>
> --On Friday, 08 August, 2008 12:46 +0200 Georg Ochsner
> <g.ochsner at revolistic.com> wrote:
>
> >> -----Ursprüngliche Nachricht-----
> >> Von: Marcos Sanz/Denic
> >> Gesendet: Donnerstag, 17. Juli 2008 09:51
> >
> >> * Section 7.3: Just a naive question, no second meanings:
> >> what reasons speak at the moment *against* including the
> >> Eszett in the PVALID list under the category of exceptions?
> >> Thanks.
> >
> > In my opinion if Denic agrees or just doesn't mind to add the
> > sharp s (Eszett), then it should be done.
>
> FWIW, I tend to agree.  In a "no mapping" world, prohibiting a
> character just because it historically case-folded into
> something else is fairly hard to justify.  That justification
> gets even harder when Unicode now includes an upper-case form
> for the character so even the historical reason for the
> case-folding is, well, history.
>
> The people who have been depending on the mapping to turn a
> string whose only non-ASCII character is Eszett into an
> all-ASCII string are going to be hurt by dropping of the
> guarantee of that mapping, independent of whether the character
> is now added to the PVALID list.
>
> Registries that don't want to see Eszett in domain names in
> their zones should simply prohibit registrations in it, thereby
> forcing everyone to use the "ss" form.
>
>    john
>
>
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