anchor.diff:      ;
   
   sizeConstraint : '(' 'SIZE' '(' constraintElements ')' ')'
  +    ;
  +
  +defValue
  +    : referenceValue
  +    |   integerValue
  +    |   choiceValue
  +    |   booleanValue
  +    |   stringValue
  +    |   bitsValue
  +    |   objectIdentifierValue
       ;
   
   value
  
positive.code: grammar ASN;
  
  moduleDefinition :
      IDENTIFIER
      'DEFINITIONS'
      ASSIGN_OP
      'BEGIN'
      moduleBody
      'END'
      ;
  
  moduleBody :
  
negative.code:     ;
  
  bitsType:
      'BITS' ('{' bitsEnumeration '}')?
      ;
  
  bitsEnumeration:
  