Why does the DICTIONARY don't show the system_privilege_map table?

Question

SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
5 rows selected.
SQL> desc system_privilege_map
Name                                      Null?    Type
PRIVILEGE                                 NOT NULL NUMBER
NAME                                      NOT NULL VARCHAR2(40)
PROPERTY                                  NOT NULL NUMBER
SQL> select count(*) from system_privilege_map;
  COUNT(*)
       166
1 row selected.
SQL> select * from dict where table_name = upper('system_privilege_map');
no rows selected
SQL>Amiel.

Answer 1

DICT is a synonym for DICTIONARY view.
Let us take a look to the DICTIONARY view definition :
SQL> select text from dba_views where view_name = 'DICTIONARY'
SQL>/
TEXT
select o.name, c.comment$
from sys.obj$ o, sys.com$ c
where o.obj# = c.obj#(+)
  and c.col# is null
  and o.owner# = 0
  and o.type# = 4
  and (o.name like 'USER%'
       or o.name like 'ALL%'
       or (o.name like 'DBA%'
           and exists
                   (select null
                    from sys.v$enabledprivs
                    where priv_number = -47 /* SELECT ANY TABLE */)
union all
select o.name, c.comment$
from sys.obj$ o, sys.com$ c
where o.obj# = c.obj#(+)
  and o.owner# = 0
  and o.name in ('AUDIT_ACTIONS', 'COLUMN_PRIVILEGES', 'DICTIONARY',
        'DICT_COLUMNS', 'DUAL', 'GLOBAL_NAME', 'INDEX_HISTOGRAM',
        'INDEX_STATS', 'RESOURCE_COST', 'ROLE_ROLE_PRIVS', 'ROLE_SYS_PRIVS',
        'ROLE_TAB_PRIVS', 'SESSION_PRIVS', 'SESSION_ROLES',
        'TABLE_PRIVILEGES','NLS_SESSION_PARAMETERS','NLS_INSTANCE_PARAMETERS',
        'NLS_DATABASE_PARAMETERS', 'DATABASE_COMPATIBLE_LEVEL',
        'DBMS_ALERT_INFO', 'DBMS_LOCK_ALLOCATED')
  and c.col# is null
union all
select so.name, 'Synonym for ' || sy.name
from sys.obj$ ro, sys.syn$ sy, sys.obj$ so
where so.type# = 5
  and ro.linkname is null
  and so.owner# = 1
  and so.obj# = sy.obj#
  and so.name <> sy.name
  and sy.owner = 'SYS'
  and sy.name = ro.name
  and ro.owner# = 0
  and ro.type# = 4
  and (ro.owner# = userenv('SCHEMAID')
       or ro.obj# in
           (select oa.obj#
            from sys.objauth$ oa
            where grantee# in (select kzsrorol from x$kzsro))
       or exists (select null from v$enabledprivs
                  where priv_number in (-45 /* LOCK ANY TABLE */,
                                        -47 /* SELECT ANY TABLE */,
                                        -48 /* INSERT ANY TABLE */,
                                        -49 /* UPDATE ANY TABLE */,
                                        -50 /* DELETE ANY TABLE */)
                  ))Which means listed only some specific objects :
1. view (o.type# = 4) started by USER%, DBA%, ALL% owned by SYS (o.owner# = 0).
2. hard coded objects owned by SYS (o.owner# = 0).
3. Objects created as PUBLIC (so.owner# = 1) synonyms (so.type# = 5) which have a name different than synonym and point to a view (ro.type# = 4) owned by SYS (ro.owner# = 0)
I have to say that I rarely use DICT(IONARY) view, for my mind it's useless, DBA_OBJECTS is more usefull.
Lastly, why created this thread in Documentation forum ?
Nicolas.