The following types of operands are used in syntax diagrams:
- Required operands are displayed on the main path line:
- Optional operands are displayed below the main path line:
- Default operands are displayed above the main path line:
Operands are classified as keywords or variables:
- Keywords are constants that must be provided. If the keyword appears in the syntax diagram in both uppercase and lowercase, the uppercase portion is the abbreviation for the keyword; for example, KEYword. Keywords are not case-sensitive.
- Variables are italicized, appear in lowercase letters, and represent names or values you supply. For example, a data set name is a variable. Variables can be case-sensitive.