[SQL] input function problem for user type array

Hello,

I have some problem with my user type array.
I have defined the following:

CREATE FUNCTION atom_in(opaque)
RETURNS atom
AS '/var/lib/pgsql/i_o/atom_input.so'
LANGUAGE 'c';

CREATE FUNCTION atom_out(opaque)
RETURNS opaque
AS '/var/lib/pgsql/i_o/atom_input.so'
LANGUAGE 'c';

CREATE TYPE atom (
internallength = 60,
input = atom_in,
output = atom_out
);

CREATE TYPE molecule (
internallength = variable,
element = atom,
input = atom_in,
output = atom_out
);

CREATE TABLE mols (mol molecule);

My question is: do i need an input function for my array type (molecule)
or the array_in function call my input function (atom_in) for every
array element successively?

Where can I see an example for user defined array type input and output
functions?

Thanx in advance for the answers,

Laszlo Molnar
GEDEON RICHTER Ltd.
HUNGARY