How do I call multiple functions in one trigger?

Hi,

Can I call multiple functions in one trigger?
Something like this:

CREATE TRIGGER match_cond_name_generate
  BEFORE INSERT OR UPDATE
  ON public.predicate_index
  FOR EACH ROW
  EXECUTE PROCEDURE public.match_cond_name_generate();
  EXECUTE PROCEDURE public.create_predicate_table();


Postgresql won't allow me to do this. Multiple triggers won't guarantee the
order of the operations. Do I have to put everything into one single
function?


Many thanks,

Wei Wang