Specifies the dataset name of the input file containing the segment data. 
                  	  
               
            
 
            	 
             
               		
               Note: Supported by the following 
                  		  
mfims imsdbu functions: 
                  		  
                  
 
                  		
                 
               	 
              
            	 
            
               Syntax:
 
               		 
               		>>-----DSN--(filespec)------><
 
               	   
            	 
            
               Parameters:
 
               		 
               		
                
                  		   
                  			 
                  -  
                     				filespec 
                     			 
                  
  
                  			 
                  -  
                     				
                     
 
                        				   
                        					 
                        - Add and Load functions 
                           					 
                        
  
                        					 
                        - The dataset name of the input file containing the segment data. 
                           					 
                        
  
                        				   
                        				   
                        					 
                        - Unload function 
                           					 
                        
  
                        					 
                        - The dataset name of the output file for the segment data. 
                           					 
                        
  
                        				   
                        				   
                        					 
                        - Useq function 
                           					 
                        
  
                        					 
                        - The dataset name of the output file for the SDEP segment data. 
                           					 
                        
  
                        				  
                        				
                     
 
                     			 
                    
                  		   
                  		
               
 
               	 
              
            	 
             
            	 
             
            
           
         
         
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