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Date: Thu, 07 Aug 2014 17:05:48 -0700 (PDT)
From: Ned Freed <ned.freed@mrochek.com>
In-reply-to: "Your message dated Thu, 07 Aug 2014 13:06:54 -0400"
 <53E3B22E.5000708@alum.mit.edu>
References: <53E3B22E.5000708@alum.mit.edu>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [abnf-discuss] Case-sensitive string constants in ABNF
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I would suggest writing this as an extension, not a revision.

				Ned

> Here is a concrete proposal for changes to RFC5234 that would add in
> case-sensitive strings using a prefix:

> 1) Revise the last half of section 2.3 (beginning with "ABNF permits the
> specification of literal text strings ") as follows:

>     ABNF permits the specification of literal text strings directly,
>     enclosed in quotation marks.  Hence:

>           command     =  "command string"

>     Literal text strings are interpreted as a concatenated set of
>     printable characters. The character set for these strings is
>     US-ASCII.

>     Literal text strings in ABNF may be either case sensitive or case
>     insensitive. The form of matching used with a literal text string is
>     denoted by a prefix to the quoted string. The following prefixes are
>     allowed:

>          %s          =  case-sensitive
>          %i          =  case-insensitive

>     If no prefix is present then the string is case-insensitive.

>     Hence:

>           rulename = %i"abc"

>     and:

>           rulename = "aBc"

>     will both match "abc", "Abc", "aBc", "abC", "ABc", "aBC", "AbC", and
>     "ABC".

>     In contrast:

>           rulename = %s"aBc"

>     will match only "aBc", and will not match "abc", "Abc", "abC",
>     "ABc", "aBC", "AbC", or "ABC".
> .
>     Another way to define a rule that is case sensitive is to specify
>     the individual characters numerically.

>     For example:

>           rulename    =  %d97 %d98 %d99

>     or

>           rulename    =  %x61.62.63

>     will match only the string that comprises only the lowercase
>     characters, abc.

> 2) Replace the char-val rule in section 4 with the following:

>           char-val       =  case-insensitive-string /
>                             case-sensitive-string

>           case-insensitive-string =
>                             [ "%i" ] quoted-string

>           case-sensitive-string =
>                             "%s" quoted-string

>           quoted-string  =  DQUOTE *(%x20-21 / %x23-7E) DQUOTE
>                                  ; quoted string of SP and VCHAR
>                                  ;  without DQUOTE


> Is there an xml2rfc version of RFC5234?

> 	Thanks,
> 	Paul

> _______________________________________________
> abnf-discuss mailing list
> abnf-discuss@ietf.org
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