Re: [idn] call for comments for REORDERING

["Soobok Lee" <lsb@postel.co.kr>]

----- Original Message ----- 
From: "Martin Duerst" <duerst@w3.org>
 > 
> >Current IDNA/nameprep does not prohibit, but discourage including 
> >unassigned code points in legal IDN labels, because new normalization/case 
> >mappings
> >would be defined on them in the future. some ACE labels including unsigned 
> >code block (tagalog?) might be proven invalid in the future. Nameprep/NFKC 
> >Versioning tag schems using new ACE prefix will be needed in the future, i 
> >guess.
> 
> Yes. But for the majority of really useful characters, in old
> and new scripts, it's rather obvious that they will be allowed.
> On the other hand, it's totally unclear how to reorder them.
> 
> Also, in case of some implementation mistake in Nameprep/NFKC,
> in most cases, it will just make a few names unusable, but
> not affect the rest. For reordering, a bug will completely
> confuse a whole script.

Never.
REoredering does not touch on unassigned code points at all.
REORDERING is idempotent  for unassigned code points.

> 
> Also, now we have a testbed, and you just think that the testbed
> is representative. But once IDN is running, to run a testbed
> for a new script will be difficult, because we need the testbed
> data for the reordering statistics, but we need the reordering
> for the testbed.
> 
 
Optimal frequency table does not exist now and future and forever.
sub-optimal solutions are often very useful and accepted and 
REORDERING is just one of them.

Soobook Lee