<area shape="rect" href="$a00944.html" title="Superclass for algorithms that produce only label hierarchies as output." alt="" coords="11,229,200,256"> <area shape="rect" href="$a00101.html" title="Superclass for all sources, filters, and sinks in VTK." alt="" coords="56,155,155,181"> <area shape="rect" href="$a01084.html" title="abstract base class for most VTK objects" alt="" coords="66,80,146,107"> <area shape="rect" href="$a01085.html" title="abstract base class for most VTK objects" alt="" coords="51,5,160,32">