In DFHZCQRT, a series of patterns define the flow through the builder modules. For each
kind of terminal, there is a different pattern.
Figure 1 illustrates the calling sequence of builders, as
determined by patterns.
If installing, DFHZCQIS selects the pattern and calls DFHTBS (table
builder service). If deleting, DFHZCQDL does the selection.
DFHTBS interprets the pattern and calls each builder that the pattern
calls out. DFHTBS knows nothing about the terminal or whether you
are installing or deleting. It does what the pattern tells it to
do.
DFHTBS passes a BPS as it calls each builder. The BPS allows one
builder to be used for many different kinds of terminals. For example,
DFHBSTC obtains the user area for all terminal types. The BPS contains
the length to be obtained. Figure 1. Calling
sequence of builders (determined by patterns)
