insert rule doesn't see id field

Two seperate problems, really, but first the SQL:

CREATE SEQUENCE person_id_seq;
CREATE TABLE person (
   name_last           VARCHAR( 50 )                       NOT NULL,
   name_first          VARCHAR( 50 )                       NOT NULL,
   id                  INTEGER                       DEFAULT nextval( 'person_id_seq' )                       PRIMARY
KEY
);
CREATE INDEX person_name_idx ON person ( name_last, name_first );

CREATE TRIGGER person_id_noup   BEFORE UPDATE ON person   FOR EACH ROW   EXECUTE PROCEDURE noup( 'id' );

CREATE RULE person_insert AS
ON INSERT TO person
DO   INSERT INTO person_log ( name_last, name_first, mod_type, person_id )   VALUES ( new.name_last, new.name_first,
'I',new.id );
 

(Problem 1)

My insert rule creates a record in person_log just fine.  It inserts
values for all of the fields except person_id.  Why doesn't new.id
contain a value?  Corresponding update and delete rules work as
expected.

(Problem 2)

I thought that the idea behind noup was to protect single columns from
update.  However, when I apply the noup trigger as above, I can't
update /any/ column.  Is this the intended behaviour?

e.g.

directory=# select * from person;name_last | name_first | id
-----------+------------+----Peterson  | Ronald     |  1Humbert   | Humbert    |  2
(2 rows)

directory=# update person set name_first='Ron' where name_first='Ronald';
NOTICE:  id: update not allowed
UPDATE 0

-- 
Ron Peterson                          -o)
Network & Systems Manager             /\\
Mount Holyoke College                _\_v
http://www.mtholyoke.edu/~rpeterso   ----