In rule authoring, a domain restricts the values of a BOM
element to a set of predefined values.
Domains for z/OS data models
You can create domains for rule projects, which are based
on data items that are defined in the z/OS® data
models (COBOL copybook or PL/I include file).
Creating a domain class for z/OS rule projects
To map a z/OS data
item (COBOL or PL/I data item) to a domain type, you must first define
the domain class. You then use the type converter to replace the default Java™ type with the domain type.