 with <TT
CLASS="COMMAND"
>ALTER EXTENSION ... DROP TABLE</TT
>.
    </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN55059"
>35.15.4. Extension Updates</A
></H2
><P
>     One advantage of the extension mechanism is that it provides convenient
     ways to manage updates to the SQL commands that define an extension's
     objects.  This is done by associating a version name or number with
     each released version of the extension's installation script.
     In addition, if you want users to 