<map id="Graphical Class Hierarchy" name="Graphical Class Hierarchy"> <area shape="rect" id="node1" href="$a03040.html" title=" " alt="" coords="5,33,144,72"/> <area shape="rect" id="node2" href="$a03500.html" title="extent" alt="" coords="192,5,336,44"/> <area shape="rect" id="node3" href="$a03860.html" title="rank" alt="" coords="193,68,335,93"/> </map>