CREATE OR REPLACE PACKAGE pkg AS  
  TYPE NumList IS TABLE OF NUMBER;  
  PROCEDURE print_numlist (nums NumList);  
END pkg; 

CREATE OR REPLACE PACKAGE BODY pkg AS 
  PROCEDURE print_numlist (nums NumList) IS 
  BEGIN 
    FOR i IN nums.FIRST..nums.LAST LOOP 
      DBMS_OUTPUT.PUT_LINE(nums(i)); 
    END LOOP; 
  END; 
END pkg; 

CREATE OR REPLACE TYPE NumList IS TABLE OF NUMBER; 

The anonymous block declares the variable n1 of the type pkg.NumList (defined in the package) and the variable n2 of the standalone type NumList.

DECLARE  
  n1 pkg.NumList := pkg.NumList(2,4);  -- packaged type  
  n2     NumList :=     NumList(6,8);  -- standalone type  
   
BEGIN  
  pkg.print_numlist(n1);  -- succeeds  
  pkg.print_numlist(n2);  -- fails  
END;