Stability of valid IDN labels

Patrik Fältström patrik at
Tue Apr 22 18:06:35 CEST 2008

On 22 apr 2008, at 16.28, Andrew Sullivan wrote:

> If I understood that correctly, then it seems possible that the
> Unicode classification of a code point could get changed between
> Unicode versions, and therefore that the derived property could
> change, too.

No, rather that is why we have a special category for "backward  
compatibility". Of course, to have a codepoint added to that category  
will require a revision of the "tables" document, which imply a  
decision can be made at that point in time whether it should be added  
or not.


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