SQL & PL/SQL

Can some one tell me a way to initialzie an associate array in package specification.

See below to what I am doing at present,but I believe is not clean because the value never changes and is used all over by package.

Help.

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function notify_feed_file(p_event_file_seq IN event_file.EVENT_FILE_SEQ%type) return error_message.error_code%type
is
Type list_of_events_t is table of event.event_code%type index by binary_integer;
list_of_events list_of_events_t;
BEGIN
list_of_events(1) := 'A01';
list_of_events(2) := 'A03';
list_of_events(3) := 'A05';

.
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