Software Package Builder 3.0 User's Guide
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Chapter 226
Software Package Hierarchy
The software package hierarchy provides the structure needed by the
filesystem to identify packaged files. Figure 2-2 provides a graphical
representation of the hierarchical structure to which a valid PSF must
adhere.
Figure 2-2 Software Package Hierarchy
Containment vs.
Reference
There are two types of relationships that exist within the hierarchical
structure of a software package: containment and reference. If a
software element acts as a container, then the software elements it is
comprised of are physically contained. If a software element acts as a
reference, then the software elements it is comprised of are virtually
contained.