<filter name="dbSetting" module="install" act="procDBSetting">
    <form>
        <node target="db_type" required="true" />
        <node target="db_database_file" required="true" minlength="1" maxlength="250" />
        <node target="db_table_prefix" required="true" minlength="2" maxlength="20" filter="alpha" />
    </form>
    <parameter>
        <param name="db_type" target="db_type" />
        <param name="db_database" target="db_database_file" />
        <param name="db_table_prefix" target="db_table_prefix" />
    </parameter>
    <response callback_func="completeDBSetting">
        <tag name="error" />
        <tag name="message" />
    </response>
</filter>
