From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Lawrence <richard.lawrence@berkeley.edu>
Subject: Re: Citation syntax: a revised proposal
Date: Mon, 02 Mar 2015 18:53:21 -0800
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To: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Cc: emacs-orgmode@gnu.org, John Kitchin <jkitchin@andrew.cmu.edu>

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

>> The first issue is that the parser includes trailing punctuation in
>> =E2=80=9Cbare=E2=80=9D @key citations.  So the following does not work a=
s expected (the
>> :key includes the period): =E2=80=9CThis was demonstrated most recently =
by
>> @Smith2015.=E2=80=9D  I=E2=80=99m not sure what the right approach is =
=E2=80=93 one option
>> would be to say that keys can contain punctuation, but must end (and
>> begin) with an alphanumeric character.
>
> I'll update the parser once there is a new syntax for keys. At the
> moment, it is correct wrt syntax.

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:
       :.#$%&-+?<>~/
=20=20=20=20=20=20=20
The `internal' here was meant to express exactly what Aaron said: keys
can contain punctuation, but may not end (or begin) with punctuation.

Best,
Richard