<map id="Graphical Class Hierarchy" name="Graphical Class Hierarchy">
<area shape="rect" id="node1" href="$a09953.html" title="Represents no type, or absence of type, for template tricks. " alt="" coords="5,19,152,44"/>
<area shape="rect" id="node2" href="$a09957.html" title="A null node updator, indicating that no node updates are required. " alt="" coords="200,5,352,57"/>
</map>