create or replace PACKAGE PS_list 
IS
	/* Set of exceptions specific to and raised by the package */
	list_undefined EXCEPTION;
	list_full EXCEPTION;
	out_of_bounds EXCEPTION;

	/* The number of items currently in the list. */
	FUNCTION nitems (list_in IN VARCHAR2) RETURN NUMBER;

	/* Append an item onto the end of the list. */
	PROCEDURE appenditem (list_in IN VARCHAR2, item_in IN VARCHAR2);

	/* Destroy the list, freeing up associated memory. */
	PROCEDURE destroy (list_in IN VARCHAR2);

	/* Delete the specified item from the list. */
	PROCEDURE deleteitem (list_in IN VARCHAR2, item_in IN VARCHAR2);

	/* Delete the Nth item from the list. */
	PROCEDURE deleteitem (list_in IN VARCHAR2, position_in IN NUMBER);
	
	/* Get the Nth item from the list. */
	FUNCTION getitem (list_in IN VARCHAR2, position_in IN NUMBER)
		RETURN VARCHAR2;

	/* Get the position of the specified item in the list. */
	FUNCTION getposition (list_in IN VARCHAR2, item_in IN VARCHAR2)
		RETURN NUMBER;

	/* Insert an item at the specified position in the list. */
	PROCEDURE insertitem 
		(list_in IN VARCHAR2, position_in IN NUMBER, item_in IN VARCHAR2);

	/* Make a new list of the specified name. */
	PROCEDURE make (list_in IN VARCHAR2);

	/* Insert an item at the first position of the list. */
	PROCEDURE prependitem (list_in IN VARCHAR2, item_in IN VARCHAR2);

	/* Replace the Nth item in the list with the new item. */
	PROCEDURE replaceitem 
		(list_in IN VARCHAR2, position_in IN NUMBER, item_in IN VARCHAR2);

    PROCEDURE display (list_in IN VARCHAR2);

END PS_list;
/