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Category 4 output uses printing characteristics (for example, Fonts, FORMDEFs, PAGEDEFs, and so on) that are defined in external resource libraries. Additional in-line AFP commands (structured fields) are used for page formatting.
The external resources can be specified using a number of methods. (The exceptions are the FORMDEF and PAGEDEF parameters; these parameters must be specified in an OUTPUT statement in the JCL of the job that creates the output.) The printing characteristics (except FORMDEF and PAGEDEF) can be specified by the application program in the JCL of the job that creates the output, using dynamic allocation (SVC99).
Without Control-D, the in-line structured fields must be inserted by the application program or by using the PPFA Conditional Processing option. They can be automatically inserted using the Control-D APAPARM option, described in The APAPARM Option.
In data centers that use a relatively small variety of PAGEDEFs and FORMDEFs, it may be advantageous to use the combined PAGEDEF and FORMDEF method. This method relies on the creation of one global PAGEDEF and one global FORMDEF used by the entire data center. Using the Control-D APAPARM option, the correct Page Format and Copy Group is used for each report. For additional details regarding this method, see Using a Global PAGEDEF and FORMDEF.
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