anchor.diff:       | objectTypeAssignement
        | trapTypeAssignement
        | moduleIdentityAssignement
  +     | moduleComplianceAssignement
        | macroAssignement
        ;
   
  
positive.code:     '::=' 'TEXTUAL-CONVENTION' (complexAttribut ','*)+
      ;
  
  trapTypeAssignement :
      'TRAP-TYPE'
       (complexAttribut ','*)+
  
negative.code:     ;
  
  macroName :
      'OBJECT-GROUP'
      | 'OBJECT-IDENTITY'
      | 'NOTIFICATION-TYPE'
      | 'NOTIFICATION-GROUP'
  