binary attribute value

["Shen, Luke" <lshen@grow.net>]

Does someone know how to make OpenLdap return binary value instead of Ascii
value?
In my Java program, I tried to pass in a byte array but when I retrieved it
from OpenLdap, it turns out to be String, though I set the snytax as binary.
(The only exception I can find is for the attribute userPassword, which is
able to return a byte array.) How can I define a new attribute that is able
to return a byte array, as userPassword does?
Thanks in advance.
Luke