digraph Polygons {
color = "White"
bgcolor="transparent";
/*bgcolor="#FFCF80";*/
label="Shape ontology";
node  [style=filled,fillcolor="Red",fontname=Helvetica,fontcolor=White]; 
/*Void_Scenario [shape = ellipse];*/
form -> polygon;
form -> ellipsoid;
polygon -> square;
polygon -> triangle;
polygon -> pentagon;
polygon -> hexagon;
ellipsoid -> ellipse;
ellipsoid -> circle;
}
