<mapping>
      <class name="Root">
          <field name="children" collection="map" container="false">
             <bind-xml>
                 <class name="org.exolab.castor.mapping.MapItem" auto-complete="true">
                    <map-to xml="child"/>
                 </class>
             </bind-xml>
          </field>
      </class>
</mapping>
