[ Table of Contents ]
This chapter presents "the big picture" -- probably the most important chapter
in this volume. An Ada program can be viewed as a set of modules, called program units, connected together to
form an architectural whole.
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We describe the different kinds of program units and the different ways of connecting them, and provide graphic symbols used to represent the modules and their connections. These symbols collectively comprise a language-specific "architecture description language" used throughout this volume. A series of example diagrams and programs are then presented, illustrating the use of the two most important kinds of program units: subprograms and packages.
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