anchor.diff:  
   actualParameterList : L_BRACE actualParameter (COMMA actualParameter)* R_BRACE
   ;
  -actualParameter : type | value /*| valueSet | definedObjectClass | object | objectSet*/
  +actualParameter : asnType | value /*| valueSet | definedObjectClass | object | objectSet*/
   ;
   exceptionSpec : EXCLAM  exceptionIdentification
   ;
   exceptionIdentification : signedNumber
    |     definedValue
  - |     type COLON value
  + |     asnType COLON value
   ;
   additionalEnumeration : enumeration
   ;
  
positive.code: 
  typeAssignment :
        ASSIGN_OP
        type
  ;
  
  valueAssignment :
        type
  	  ASSIGN_OP
         value
  ;
  type : (builtinType | referencedType) (constraint)*
  ;
  builtinType :
     octetStringType
  
negative.code: 
  typeFieldSpec : AMPERSAND IDENTIFIER typeOptionalitySpec?
  ;
  typeOptionalitySpec : OPTIONAL_LITERAL | (DEFAULT_LITERAL asnType)
  ;
  fixedTypeValueFieldSpec : AMPERSAND IDENTIFIER asnType UNIQUE_LITERAL? valueOptionalitySpec ?
  ;
  valueOptionalitySpec : OPTIONAL_LITERAL | (DEFAULT_LITERAL value)
  ;
  