Map and .mdq file DD statements in the CICS startup JCL

The CICS preloader loads maps and .mdq files from a partitioned data set (PDS or PDSE) or from a z/OS® flat file.

Map or .mdq files in a z/OS flat file
The name of the map or .mdq file must be the ddname of the DD statement that allocates the resource in the CICS startup JCL. The data set name (DSN parameter) is the name of the z/OS flat file that contains the map.
Map or .mdq files in a PDS or PDSE
When a map or .mdq file is a partitioned data set (PDS or PDSE), its DD statement determines how you specify it in the preloader control file.

Parent topic: Preloading IBM Transformation Extender maps and .mdq files in a z/OS CICS environment