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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Concatenate enumeration
Date: Wed, 25 Nov 2009 16:53:07 -0600
Organization: Jacob Sparre Andersen
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Date: 2009-11-25T16:53:07-06:00
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"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message 
news:wcctywksu8t.fsf@shell01.TheWorld.com...
...
>> You can't. Enumeration types are not extensible.
>
> Extensible enumeration types were proposed for Ada 9X,
> but were dropped.

And were proposed again for Ada 2005, and were dropped again. See 
AI95-0261-1. I doubt it will ever be proposed again.

                        Randy.