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

[John C Klensin]

--On Friday, 22 December, 2006 12:52 -0800 Paul Hoffman
<phoffman at imc.org> wrote:

> 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.

I thought I noted that exception in my note.  If I did not, I
apologize.  And, of course, draft-alvestrand-idnabis-bidi... is
precisely about that rule being a little too simple.

   john