.-,---.     
           V     |     
>>-DDName(---ddn-+-)-------------------------------------------><

ddn

Specifies the name of the DD statement that identifies a volume whose partitioned data sets, if selected, are to be compressed. To assure correct processing, each of the DD statements corresponding to a DDNAME (ddn) must identify only one volume serial number.

For additional information about storage requirements when processing multiple volumes, see the Storage requirements.