accessing composite value's field in function

I try to print out field of composite value in my procedure
--

CREATE OR REPLACE FUNCTION add_position(rs requirement_vo )
  RETURNS void AS
$BODY$
    DECLARE
    BEGIN
    RAISE NOTICE rs.name;
  END;
$BODY$
--
However "rs.name" causes "ERROR: syntax error at or near "rs.name"".
So how should I access composite value's field inside of the function?

--
Nikita Koselev