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Re: [spfbis] WGLC: draft-ietf-spfbis-4408bis-14

Alessandro Vesely <vesely@tana.it> Thu, 09 May 2013 15:31 UTC

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Date: Thu, 09 May 2013 17:31:18 +0200
From: Alessandro Vesely <vesely@tana.it>
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Subject: Re: [spfbis] WGLC: draft-ietf-spfbis-4408bis-14
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On Wed 08/May/2013 23:09:24 +0200 Murray S. Kucherawy wrote:
> On Wed, May 8, 2013 at 10:14 AM, Scott Kitterman <spf2@kitterman.com> wrote:
>>> ABNF rules say literal strings in productions are
>>> case-insensitive.  That means the macro-letter set actually
>>> implicitly includes all of the capital letter equivalents.  If
>>> we want to constrain it to lowercase only, we need to use hex
>>> notation.
>>
>> OK.  If someone would provide those, it would be great.  Otherwise, I'll
>> take a shot at it, probably Friday.
>
> The "ascii" man page on your favourite UNIX distribution has them.  You're
> looking for something like:
> 
>    macro-letter     =  %x73 / %x6c / ...

No, wait.  Do we really want that?

The syntax of URL escaped expansions is the same as that of lowercase
macros.  We don't need two parallel sets of production rules, do we?

IMHO, adding a comment, e.g. as follows, such suffice.

  macro-letter     = "s" / "l" / "o" / "d" / "i" / "p" / "h" /
                      "c" / "r" / "t" / "v"
                     ; uppercase or lowercase, see URL escaping below

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