Mixing scripts (Re: Unicode versions (Re: Criteria for exceptional characters))

Fri Dec 22 21:52:30 CET 2006

At 12:21 PM -0500 12/22/06, John C Klensin wrote:
>IDNA2003 operates on characters, not
>complete labels.

Mostly true, but there is an important exception. Nameprep section 6 
(bidi checking) works on the whole label, not just on individual 
characters. Fortunately, the rule defined there (inherited from 
Stringprep) is extremely simple to describe and therefore to 
implement.