|  | 
        
          |  |  | 
        
          |  | 
        
          |  | Status |  | 
        
          |  | M | 
            
              |  |  | Restricted codes | All codes |  
              |  | A character string to identify and distinguish uniquely, one instance of an object in an identification scheme from all other objects within the same scheme. |  |  | 
        
          | 
            
              |     | Identification Scheme. Identifier |  | O | 
            
              |  |  | Restricted codes | All codes |  
              |  | The identification of the identification scheme. |  |  | 
        
          | 
            
              |     | Identification Scheme Agency. Identifier |  | O | 
            
              |  |  | Restricted codes | All codes |  
              |  | The identification of the agency that maintains the identification scheme. |  |  |