From: Andrew West (andrewcwest@gmail.com)
Date: Mon Dec 28 2009 - 05:42:13 CST
2009/12/28 Asmus Freytag <asmusf@ix.netcom.com>:
>
>> For the rest, allow all ***assigned*** code points, filter unassigned.
>
> That's a fool's game, because assigned code points are version dependent.
> Even if one could adopt a "supported version" for one's own code, nothing
> guarantees that the codes were assigned at the time the originating software
> was written. If not, they could represent data that wasn't really text in
> the context it was created in. Further, the minute the next version of
> Unicode comes along, this will prevent the software from handling perfectly
> well-defined and standardized characters.
>
>> 3) For code points in planes 3 to 13 (unassigned planes) filter the
>> complete range 0x30000 to 0xDFFFF.
Asmus's comment also applies here. There is no guarantee that Planes
3-13 will always remain unassigned, and in fact there is a very strong
probablility that Plane 3 will be assigned before very long.
Andrew
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