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USAGE(*INPUT *OUTPUT *UPDATE *DELETE)

The USAGE keyword is used in a free-form file definition to specify the way the file can be used.

The USAGE keyword is optional, but if it is specified, it must have at least one parameter.
*INPUT
input
*OUTPUT
output
*UPDATE
input and update
*DELETE
input, update, and delete
Some values imply more than one usage. For example, *UPDATE implies both input and update. The following USAGE keywords have the same meaning:
 USAGE(*INPUT : *UPDATE)
 USAGE(*UPDATE)
The default usage for a file depends on the device-type of the file.
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