From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Subject: Re: Citation syntax: a revised proposal
Date: Tue, 03 Mar 2015 09:38:48 +0100
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In-Reply-To: <878ufeaj1a.fsf@berkeley.edu> (Richard Lawrence's message of
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To: Richard Lawrence <richard.lawrence@berkeley.edu>
Cc: emacs-orgmode@gnu.org, John Kitchin <jkitchin@andrew.cmu.edu>

Richard Lawrence <richard.lawrence@berkeley.edu> writes:

> Sorry, I may not have emphasized this enough, but in the grammar, I wrote:
>
>   - A KEY optionally begins with `-', and obligatorily contains `@' or
>     `&' followed by a string of characters which begins with a letter
>     or `_', and may contain alphanumeric characters and the following
>     *internal* punctuation characters:
>        :.#$%&-+?<>~/
>        
> The `internal' here was meant to express exactly what Aaron said: keys
> can contain punctuation, but may not end (or begin) with punctuation.

OK. I misunderstood the "internal" part. 

What about "@_" and "@a" ? Are they valid keys?


Regards,