SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for Linux: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production

SQL> select comp_id, version, status from dba_registry where comp_id='xml';

no rows selected

SQL> select comp_id, version, status from dba_registry where comp_id='xml';

no rows selected

select dbms_xmlquery.getxml('select * from t_appliction where rownum <= 3') from dual;
/

     *
ERROR at line 1:
ORA-00911: invalid character

SQL> select comp_id, version, status from dba_registry where comp_id='xml';
select comp_id, version, status from dba_registry where comp_id='xml'
                                     *
ERROR at line 1:
ORA-00942: table or view does not exist