10.6. Application Partitioning
Figure 10-6 illustrates a subsystem, also called an application, that has visible and private package components. The contrast between the white and shaded part denotes a package specification part as distinct from a package body. The white, “exposed” slots represent components of an API. The API defines the interface and, in general, specifies what the package does. The body is the implementation. To see the implementation (i.e., how the code performs its task), one must look at the package code.
Figure 10-6. Booch Diagram: Subsystem with Packages and Stand-Alone Programs.
The design of a system begins with partitioning ...
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