Method: GET_AS_STRING
Method: REFRESH
Method: CONSTRUCTOR
Method: EVALUATE
Method: SORT_CHILD_NODES
Method: EVAL_ATTRIBUTE
Method: EVAL_RIGHT
Method: INSERT_TEXT
Method: FORMULA_TO_STRING
Method: DELETE_NODES
Method: PARSE
Method: ADD_PARAMETER
Method: SET_PARENT_NODE
Method: CHECK_TERMINAL
Method: LOAD_GRAMMAR
Method: IS_OPERATOR
Method: ADD_CHILD_NODE
Method: CREATE_NODE
Method: INIT