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Re: [Json] ABNF nits

"Manger, James H" <James.H.Manger@team.telstra.com> Fri, 07 June 2013 02:24 UTC

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From: "Manger, James H" <James.H.Manger@team.telstra.com>
To: "Joe Hildebrand (jhildebr)" <jhildebr@cisco.com>, "json@ietf.org" <json@ietf.org>
Date: Fri, 07 Jun 2013 12:24:47 +1000
Thread-Topic: ABNF nits
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Subject: Re: [Json] ABNF nits
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> Some things I found futzing with the ABNF:
> 
> - normalize the indentation (makes it easier to pull out)
> - Hex literals need to be uppercase.  The false and null rules are
> wrong.

Lowercase is allowed in hex literals.
It links back to HEXDIG in RFC5234 (or RFC 4234).
You have to remember the sneaky ABNF rule that quoted strings (eg "A") are case insensitive. "A" is equivalent to %x41 / %x61.

> - DIGIT and HEXDIG are neither defined nor imported, as far as I can
> tell.
>  I suggest:
> 
> DIGIT = %x30-39                        ; 0-9
> HEXDIG = %x30-39 / %x41-46 / %x61-66   ; 0-9, A-F, or a-f

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