[idn] stringprep and unassigned code points

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

----- Original Message ----- 
From: "Patrik Fältström" <paf@cisco.com>
 > 
> Say that the mapping exists in version 3, but not in version 2 of nameprep.
> 
> This implies that X is not an assigned codepoint in version 2.
> 
> Y can have been assigned in version 2.
> 
> An application which read X from a keyboard or something else where the
> name "enters the system" have to do nameprep. Two things can now have
> happened. Either the application understand version 3 of nameprep, and X is
> mapped to Y, or the application does not understand version 3, and then X
> is not allowed, as no non-assigned codepoints is allowed.
> 
> In neither of these cases X will be transferred over to the other
> application.
> 

Do you mean that old nameprep application cannot encode unassigned code
points into ACE label at all ?  What do you mean by "query" that can 
contains unassigned code points  in your stringprep document ? 
Is it native label  or ACE one ?  Please suggest real applications 
which will process input native labels as "query"  or  "stored strings" .

Soobok Lee