Mapping and Variants

[Martin Duerst]

John said in an earlier mail
(http://www.alvestrand.no/pipermail/idna-update/2009-March/003751.html,
second to last paragraph) that he thinks that if we do mapping,
we have to map all of upper and lower case Latin a and Greek alpha
to the same thing.

The only thing I want is to very, very strongy question the above.

Of course, somebody will registers A$B&!(B, where the first is Latin
and the second is Greek, e.g. on a third or fourth level, just
because they can, but what I'm trying to say is that this is not
a typical use case, and not one that we have to design mapping for
(independent of whether mapping is part of the protocol
(most probably not) or otherwise).

Regards,   Martin.


At 15:08 09/03/09, Patrik F$BgM(Btstr$B‹N(B wrote:
>On 9 mar 2009, at 03.52, Martin Duerst wrote:
>
>> My point was that this is mainly theoretical, because mixing
>> scripts in general, and very much in this case, is a bad idea,
>> nonwithstanding examples where it actually might make some sense,
>> such as $B&L(Bvolt. Can you give an example that makes a bit more
>> sense than just "AA"?
>
>Martin, people will most certainly register this, "just because they  
>can". The example because of this I think is valid.
>
>You also have to remember that people do have interest in mixing  
>scripts, for example various scripts and latin.
>
>To limit the problems we do have in IDNA2008 two things that protect  
>against problems:
>
>- We have defined what is a U-label and A-label, and because of this,  
>it is a very very clear signal what codepoints should be used. If we  
>also have mappings, fine, but it is clear that those characters are in  
>the gray area whether they should be used for example in publications.
>
>- We have for the most problematic situations regular expressions that  
>limit the use of some codepoints that create real problems if they are  
>used in a non-intended-context.
>
>What do you want more? You want more regular expressions? You want to  
>reopen the discussion on mixing scripts again?
>
>    Patrik
>
>
>
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#-#-#  Martin J. Du"rst, Assoc. Professor, Aoyama Gakuin University
#-#-#  http://www.sw.it.aoyama.ac.jp       mailto:duerst at it.aoyama.ac.jp