How to deinstall/remove XML Database (XDB) 9.2 and 10.2

How to deinstall/remove XML Database (XDB) 9.2 and 10.2
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THIS NOTE IS NOT FOR 11G and above.

This is for remove the XDB feature into an existing Oracle database.

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XDB SCHEMA REMOVAL STEPS:
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WARNING: The steps to remove the XML Database feature (XDB schema) will completely remove the XDB repository including any user defined information contained within it.
Therefore, if there are any registered schemas or XML Database items created, you will be required to recreate all of your user defined structures, data and re-register all schemas previously registered.

WARNING: If you are on database release 10.1.x or 10.2.x the XDB Feature is Mandatory in order to use any of the member functions of the XMLTYPE. This is true even if you are not using the repository , or registered schema aspects of the XDB feature.

WARNING: This is not for 11g.

1. Shutdown and restart the database.

2. Connect as sysdba and run the catnoqm.sql script. Maintain a spool of the
script running:

UNIX: $ORACLE_HOME/rdbms/admin subdirectory
WINDOWS: $ORACLE_HOME\rdbms\admin subdirectory

For Example:
SQL> set echo on
SQL> spool xdb_removal.log
SQL> @?/rdbms/admin/catnoqm.sql


3. Modify the init.ora file or spfile to include the following minimums to prepare the DB for reinstalling the XDB schema:

shared_pool_size =150M
java_pool_size =150M

4. Turn on AUTO EXTEND on the XDB tablespace.
If you do not want to do this , make sure you target a tablespace with at
least
.100 MB of free space for non-UTF8 DB
.150 MB of free space for an AL32UTF8 DB

5. Shutdown the database immediate, and startup the database normal

NOTE: Failure to restart the database at this step can cause XDB catqm.sql installation to fail with an internal error similar to the following: ORA-7445 [qmr_hdl_copy()+48]