Class,Attribute,Type,Default,Min,Max,Sample1,Extras
Shape,,,,,,,isAbstract
OpenShape (Shape),,,,,,,isAbstract
Line (OpenShape),,,,,,,
,x1,float,,,,,
,y1,float,,,,,
,x2,float,,,,,
,y2,float,,,,,
Squiggle (Line),,,,,,,
,cx1,float,,,,,
,cy1,float,,,,,
,cx2,float,,,,,
,cy2,float,,,,,
ClosedShape (Shape),,,,,,,isAbstract
,area,float,,,,,
Rectangle (ClosedShape),,,,,,,
,x1,float
,y1,float
,x2,float
,y2,float
Circle (ClosedShape),,
,x1,float
,y1,float
,radius,float