A data structure can be used to:
Data structures are defined on the input specifications the same way records are defined. The record specification line contains the data structure statement (DS in positions 19 and 20) and the data structure name (optional). The field specification lines contain the subfield specifications for the data structure.
Data structure specifications must follow the input specifications for records. All entries describing a data structure and its subfields must appear together.
For more detail see Data Structure Specification Entries.
(C) Copyright IBM Corporation 1992, 2006. All Rights Reserved.