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Date: Wed, 06 Aug 2014 13:09:40 -0400
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Archived-At: http://mailarchive.ietf.org/arch/msg/abnf-discuss/oZzWBiA94lYG5LrK0xUjxLiuzXQ
Subject: [abnf-discuss] Case-sensitive string constants in ABNF?
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Has there ever been consideration of supporting case-sensitive string 
constants in ABNF?

While the case-insensitive ones are more often than not what is needed, 
some protocol designs have places where case-sensitivity is desired. It 
is possible to accomplish this now, using numeric byte values. But it is 
hard, both to read and to write.

I see no *technical* problem with supporting both kinds. The only 
questions are:
- Is it a good idea to support both? (Or is *not* supporting them
   intentional, to discourage case-sensitive syntaxes?)

- What syntax to use in ABNF to denote the two types, while remaining
   backward compatible.

Regarding the syntax, a straightforward approach would be to define 
case-sensitive strings using a new delimiter. Single quote is a likely 
candidate since it is currently unused.

Another possibility for syntax would be to allow an optional prefix on 
char-val. For example: %S"abc", %I"abc".

	Thanks,
	Paul

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