Distribution library (DLIB)

ddname: The ddname for a distribution library should match the low-level qualifier of the data set name. For example, the ddname for SYS1.AMACLIB should be AMACLIB.
Use: Distribution libraries (DLIBs) contain updated versions of macros, source, and modules that were shipped by IBM® and stored during ACCEPT processing. They are used during system generation to build the target libraries, so you should keep them at a tested functional and service level. They are also used during RESTORE processing to replace elements in the target libraries. You must provide a DDDEF entry or DD statement for each distribution library that is being processed.
Attributes: Partitioned.
Device: Direct access only.