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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: S-expression I/O in Ada
Date: Fri, 13 Aug 2010 19:57:32 -0500
Organization: Jacob Sparre Andersen
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"Jeffrey Carter" <spam.jrcarter.not@spam.not.acm.org> wrote in message 
news:i4463s$hus$1@adenine.netfront.net...
...
> Both seem to be standards. {} is used in the ARM, Annex P, with its 
> standard meaning of "zero or more", which is why I used it, and am 
> surprised Brenta didn't understand it.

The grammar notation of Ada is described in section 1.1.4 
(http://www.adaic.com/standards/05rm/html/RM-1-1-4.html). One rather 
presumes that Ada programmers are at least somewhat familar with it, so it 
makes a good choice to use for grammars on this newgroup.

                       Randy.