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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: Giving a package specification access to the private types of
 another package
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news01+Steven.Murdoch@cl.cam.ac.uk (Steven Murdoch) writes:

>... A is used by B and by no other package,
> all of the procedures in A are used by B.

Then A is really part of the implementation of B, so it should be
"private package B.A is...".

You can also use subunits, but child packages are a bit more flexible.

- Bob