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 
                     			 
                  
- The level of X/Open definition COBOL to be compatible with: 
                     				
                      
                        				   
                        					 
                        - 3 
                           					 
                        
- Compatible with X/Open Portability Guide 1988 (XPG-3) 
                           					 
                        
- 4 
                           					 
                        
- Compatible with X/Open CAE Specification (XPG-4) 
                           					 
                        
 
  
            	 
            
               Properties:
 
               		 
               		
                
                  		
                  
                      
                        			  
                        			  
                        			 
                         
                           				
                            
                              				  
                              | Default: | NOXOPEN | 
 
                           				
                            
                              				  
                              | Phase: | Syntax check | 
 
                           				
                            
                              				  
                              | $SET: | Initial | 
 
                           			 
                         
                        		  
                     
                    
                  		
                 
               	 
              
            	 
            
               Dependencies:
 
               		 
               		
               XOPEN sets RTNCODE-SIZE"4" immediately. 
                  		
               
 
               	 
              
            	 
             
            
           
         
         
Comments:
Specifying XOPEN with no parameter is the same as specifying XOPEN"4". If you specify XOPEN"4", National Character Support is enabled using the DBCS"3" directive.