Required if there is more than one record format for the file.
The value specified in the FORMAT phrase contains the name of the record format to use for this I-O operation. The system uses this to specify or select which record format to operate on.
Identifier-2, if specified, must be an alphanumeric data item of 10 characters or less.
Literal-1, if specified, must be an uppercase character-string of 10 characters or less.
A value of all blanks is treated as though the FORMAT phrase were not specified. If the value is not valid for the file, a FILE STATUS of 9K is returned and a USE procedure is invoked, if applicable for the file.