<area shape="rect" href="$a00520.html" title="abstract base class for all extract selection filters." alt="" coords="5,304,176,331"> <area shape="rect" href="$a00363.html" title="Superclass for algorithms that produce only data object as output." alt="" coords="8,230,173,256"> <area shape="rect" href="$a00101.html" title="Superclass for all sources, filters, and sinks in VTK." alt="" coords="41,155,140,182"> <area shape="rect" href="$a01084.html" title="abstract base class for most VTK objects" alt="" coords="51,80,131,107"> <area shape="rect" href="$a01085.html" title="abstract base class for most VTK objects" alt="" coords="36,6,145,32">