mvs_definition
The mvs_definition identifies a keyword that is generated by the host and, for Default and some Mapping statements, its associated parameter. It follows this format:
mvs_keyword[=mvs_parameter]
Note: In Control Statements, mvs_definitions, controls, and infoprint_definitions
themselves cannot contain any white space (spaces or tabs). The first
occurrence of white space separates the mvs_definition from the control
and the second separates the control from the infoprint_definition.
As a result, if the elements contain white spaces, the DCF will not
complete the mapping correctly.
These values are described
below.