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>      * Add new field timecreated to table stampcoll_stamps.
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>         $field = new xmldb_field('timecreated', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, null, null, null, 'text');
>         if (!$dbman->field_exists($table, $field)) {
>             $dbman->add_field($table, $field);
>         }