anchor.diff:  
   default_value
       : NULL
  -	| DEFAULT
  +    | DEFAULT
       | constant
       ;
   
  
positive.code:     | LOCAL_ID
      ;
  
  full_column_name (
      : (table_name '.')? id
      ;
  
  column_name_list_with_order
      : id (ASC | DESC)? (',' id (ASC | DESC)?)*
      ;
  
  cursor_name
  
negative.code: COMPATIBILITY_LEVEL:                   C O M P A T I B I L I T Y '_' L E V E L;
  CONCAT:                                C O N C A T;
  CONCAT_NULL_YIELDS_NULL:               C O N C A T '_' N U L L '_' Y I E L D S '_' N U L L;
  CONTENT:                               C O N T E N T;
  CONTROL:                               C O N T R O L;
  COOKIE:                                C O O K I E;
  COUNT:                                 C O U N T;
  