Arrays Question

Hi
Is it possible to have subarrays from an array constant??
Is it possible to have indices on arrays??

For the first here it is whats on 7.1.2:

dynacom=# select  '{1,2,3}'::_int4  ;
 ?column?
----------
 {1,2,3}
(1 row)

dynacom=#

dynacom=# select  '{1,2,3}[1:2]'::_int4  ;
 ?column?
----------
 {1,2,3}
(1 row)

dynacom=#

What would someone expect is the select to return {1,2}.

Any one has a clue???

If postgresql had this feature along with the indexing on arrays, that would
make it (not that it is not allready!) the perfect candidate for tree
manipulation.

Thanx in advance
--
Achilleus Mantzios
S/W Engineer
IT dept
Dynacom Tankers Mngmt
tel:    +30-10-8981112
fax:    +30-10-8981877
email:  it@dynacomtm.com
        rnd@gatewaynet.com