An Access Control Entry (ACE) consists of a series of fields started and
ended by parentheses.  The first field indicates the type of ACE to be
entered.  The second field indicates any options that apply to the ACE.
The third field indicates the type of access to grant or to be monitored
(if applicable).  In addition, the second and third fields have several
subfields for the actual options and access types, respectively.

The general format for an ACE is as follows:

        (type, option_flags, access_to_grant)