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From: Robert A Duff <bobduff@TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: I do not understand this error...
Date: Mon, 08 Feb 2016 18:33:54 -0500
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Date: 2016-02-08T18:33:54-05:00
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"Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org> writes:

> On 02/07/2016 08:51 PM, John Smith wrote:
>> 
>> Stupid question.  What do you mean by a library-level package?  Is this just
>> a regular package that has these callbacks declared and I just include it in
>> my application?
>
> "Library-level" means not nested in anything else.

It means not nested in any procedure, function, or task.
In can be nested in arbitrarily many packages, and still be
library level.

> [Technically, nested directly in Standard, since all compilation units are
> considered nested directly in Standard. Standard is usually not mentioned
> explicitly, though, so this may be confusing to a beginner.]

I'm not sure what you mean by "directly" there, but if you say
"package A.B is...", B is inside of A, and A is inside of Standard.
And all of Standard, A, and B are library level.

- Bob