RE: ABNF tweak for draft-zeilenga-ldapbis-rfc2253-02

["Ryan Moats" <rmoats@coreon.net>]

Please, I understand UNICODE and laud what you are saying here.
However, my reading is that the draft covers this already,
because quotechar only shows up in:

string     = *( stringchar / pair )
             / "#" hexstring
             / QUOTATION *( quotechar / pair ) QUOTATION

so quotechar only needs to go to 0xFF as that covers all of the 
UTF-8 encoding.

I agree that the ABNF below is more specific, but I don't see
how changing quote character to -0xFF (and yes I got that
wrong the first time), breaks any of the examples in the draft.

Ryan

-----Original Message-----
From: Kurt D. Zeilenga [mailto:Kurt@OpenLDAP.org]
Sent: Monday, December 18, 2000 6:53 PM
To: rmoats@coreon.net
Cc: ietf-ldapbis@OpenLDAP.org
Subject: Re: ABNF tweak for draft-zeilenga-ldapbis-rfc2253-02


At 07:47 PM 12/18/00 -0500, rmoats@coreon.net wrote:
>Ok, I'll bite... what does ASCII have to do with this other 
>than extending the last range to FF...

Extending the range to FF is not sufficient.  The ISO-10646-1
character code range, IIRC, is 0x000000 - 0x7FFFFFFF.  When
presented as UTF-8, each character spans from 1 to 6 octets
(derived from RFC2849):

UTF8-CHAR                = ASCII / UTF8-2 / UTF8-3 /
                           UTF8-4 / UTF8-5 / UTF8-6
UTF8-1                   = %x80-BF
UTF8-2                   = %xC0-DF UTF8-1
UTF8-3                   = %xE0-EF 2UTF8-1
UTF8-4                   = %xF0-F7 3UTF8-1 
UTF8-5                   = %xF8-FB 4UTF8-1
UTF8-6                   = %xFC-FD 5UTF8-1
ASCII                    = %x00-7F

Your original suggestion would limit escaping to only ASCII
characters.  With the range extension, the escaping would
apply to the first octet of the character, not to the whole
character.

Kurt



>Ryan
>
>---- Original message ----
>>Date: Mon, 18 Dec 2000 16:03:33 -0800
>>From: "Kurt D. Zeilenga" <Kurt@OpenLDAP.org>
>>Subject: Re: ABNF tweak for draft-zeilenga-ldapbis-rfc2253-02
>>To: "Ryan Moats" <rmoats@coreon.net>
>>Cc: <ietf-ldapbis@OpenLDAP.org>
>>
>>At 11:33 AM 12/10/00 -0600, Ryan Moats wrote:
>>>I'd suggest
>>>
>>>   quotechar = %x00-%x21 / %x23-%x5B / %x5D-7F ; any 
>character except "\" or
>>>QUOTATION
>>
>>Note that any character is not restricted to ASCII.
>>
>>Kurt
>>