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From: dewar@cs.nyu.edu (Robert Dewar)
Newsgroups: comp.lang.ada
Subject: Re: Child packages
Date: 19 Oct 1994 19:13:16 -0400
Organization: Courant Institute of Mathematical Sciences
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References: <1994Oct4.090807@di.epfl.ch> <37kanl$jfd@u.cc.utah.edu>
  <EACHUS.94Oct17115240@spectre.mitre.org> <1994Oct18.103131@di.epfl.ch>
  <EACHUS.94Oct18093732@spectre.mitre.org>  <3816h5$n3g@schonberg.cs.nyu.edu>
  <EACHUS.94Oct19110308@spectre.mitre.org>
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Date: 1994-10-19T19:13:16-04:00
List-Id: <comp.lang.ada>

Norman, there is still a big difference between modifying the text of a 
package and adding a child, much to big for tantamout :-)

The big difference is that if you modify the text of a package you can
blow up existing clients of that package in different programs.

If you write a child, it is completely separate, and affects on programs
that use the child,

so the level of access controls needed is quite different. a given program
may want to lock out any additional child units, and another program may
wish to allow them, but neither could permit the mucking with a shared
package's text.