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

["Edmon Chung" <edmon@neteka.com>]

I dont quite understand why we need to have 3.
Isnt 3 a subset of 2?
Also

-----
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.
-----

Also this will mean that there cannot be a mixture between RTL and LTR
characters.  While I am not familiar with Arabic, I sure have seen English
words mixed with Arabic in phrases, albeit rare.  I didnt see much
discussion on the list before on bidi issues, but I did see an example used:

> Assume there were two labels inside the DNS, one reading ABCdef
> and the other reading defABC, and both would be displayed
> CBAdef. Who would consider that usable for the DNS?

Why would both be displayed the same?  Shouldn't defABC be displayed as
defCBA?  Given the context of a domain name within a DNS.

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 (eventhough it is mentioned early in the doc that Nameprep deals
with labels), because in Stringprep that wasnt clear and also a given
"string" can be a "part" of a label, so there could be two "strings", one
containing LTR one RTL in the same label.

Edmon



----- Original Message -----
From: "James Seng" <jseng@pobox.org.sg>
To: "IETF/IDN WG" <idn@ops.ietf.org>
Sent: Sunday, July 07, 2002 4:06 AM
Subject: [idn] IDN WG Last Call on two major changes to Stringprep


> The IETF last call have been concluded and the latest version of
> Stringprep is in the I-D directory:
>
> http://www.ietf.org/internet-drafts/draft-hoffman-stringprep-04.txt
>
> Other then editorial changes, there are two significant changes*:
> - Reference Unicode 3.2, updating all the tables from 3.1 to 3.2.
> - Additional Bidirection characters handling, Section 6 and Appendix D.
>
> The co-chairs is conducting a working group last call on these two
> significant changes. Please send any proposed modification of text to the
> wg mailing list as well as the wg co-chairs, stating clearly the text to
> be modified and the new text.
>
> This three weeks WG last call will end on 28th July 2002, 23h59 GMT-5.
> (We have a three weeks last call instead of the usual two weeks for those
> who is busy preparing for IETF Yokohama)
>
> Marc & James
> co-chairs
>
> * The previous of Stringprep can be found at
> http://www.potaroo.net/ietf/old-ids/draft-hoffman-stringprep-03.txt
>
>
>