プロシージャの入れ子

CREATE OR REPLACE PROCEDURE proc_nest_sample
AS
    PROCEDURE proc_sub_one AS
    begin
        DBMS_OUTPUT.PUT_LINE('I am proc_sub_one');
    end proc_sub_one;

    PROCEDURE proc_sub_two AS
    begin
        DBMS_OUTPUT.PUT_LINE('I am proc_sub_two');
    end proc_sub_two;
BEGIN
    proc_sub_one();
    proc_sub_two();
end;