Declaring a global table in PL/SQL

Why can't I have?

CREATE OR REPLACE PACKAGE BODY test AS

    TYPE test_table IS TABLE OF VARCHAR2(30)

         INDEX BY VARCHAR2(2);     DEMO_TABLE test_table;
    DEMO_TABLE('NO') := 'No';

END test;
/ Received on Wed Aug 03 2005 - 22:47:47 CDT