Re: IDN WG Last Call on two major changes to Stringprep

I think I am lost.  (which also suggests that the wordings need to be
improved)
Please clarify two simple things:
a. Are mixed RTL and LTR characters allowed within a label?
b. If there are more categories than R, AL and L that we are discussing,
then in point 3 it should not say "As defined above":

-----
2) If a string contains any Right-to-Left character (defined as
belonging to Unicode bidirectional categories "R" and "AL"), the string
MUST NOT contain any Left-to-Right character (defined as belonging to
Unicode bidirectional category "L").

3)  If a string contains any Right-to-Left character (as defined above),
a Right-to-Left character MUST be the first character of the string, and
a Right-to-Left character MUST be the last character of the string.
-----

Edmon


----- Original Message -----
From: "Paul Hoffman / IMC" <[email protected]>
To: <[email protected]>
Sent: Monday, July 08, 2002 10:04 AM
Subject: Re: [idn] IDN WG Last Call on two major changes to Stringprep


> At 7:37 AM -0400 7/8/02, Edmon Chung wrote:
> >I dont quite understand why we need to have 3.
> >Isnt 3 a subset of 2?
>
> No. There are many categories, not just R, AL, and L, as detailed in
> the Unicode standard.
>
> >. . . Why would both be displayed the same?
>
> Read the Unicode standard for information on this.
>
> >Furthermore, the section for bidi in Nameprep should be updated to
specify
> >that it is meant to say within a label there cannot be both RTL and LTR
> >characters
>
> That's not true.
>
> --Paul Hoffman, Director
> --Internet Mail Consortium
>
>