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From: Wes Groleau <wwgrol@ftw.rsc.raytheon.com>
Subject: Re: Is Apex dead as an environment for Ada & Java?
Date: 1999/12/09
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Newsgroups: comp.lang.ada
Date: 1999-12-09T00:00:00+00:00
List-Id: <comp.lang.ada>

I don't get why the presence of the subsystems feature (which doesn't
have to be used) should make an IDE "dead."

That aside, subsystems as Apex defines them are simply a higher level of
partitioning than package hierarchies (or subsystems as defined by Ada
Quality and Style).  

A package has visible items and non-visible items.

The analogous attribute of an Apex subsystem is "exported" and "not
exported."

A package can be with'ed by another package

A subsystem can be imported by another package.