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  Directive:    XOPEN
 
  Function:     Specifies that words reserved under the X/Open definition
                of COBOL are to be treated as reserved words.
 
  Syntax:
 
     ►►─┬───┬─┬───────XOPEN──"level"───┬────────►◄
        └─/─┘ └┬────┬─XOPEN────────────┘
               └─NO─┘
 
  Parameters:   level                Must be 3 or 4. The level of
                                     X/Open definition COBOL to be
                                     compatible with.
 
  Default:      NOXOPEN
 
  Phase:        Syntax check
 
  $SET:         Initial
                                    -♦-