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PREEXIT=modname

Specifies the name of your user-coded preprocessing exit. The purpose of this exit is to allow you to write custom code to select data sets for compression. This is only necessary when TCF's selection process (SCAN, SELECT, and EXCLUDE statements) does not give you enough power to select just the data sets you want to select. Your exit receives control before catalog and format 1 DSCB information is obtained for the data set. You can set a return code to force TCF to bypass the data set. See PREEXIT Pre-Processing Exit in the chapter User Exits for more information.