When the class mechanism is used to contain classes and routines of a package of some sort, one is usually not interested in creating an object of the class. Instead, the class is used as prefix on a block (or on another class which in turn is used as prefix on a block, if one wishes to specialize the package further.
The class which is used as prefix must be supplied with actual parameters. Example:
-- part contents for card part 2
----- text -----
class DrawingPrimitives(ScreenWidth,ScreenHeight); integer ScreenWidth,ScreenHeight;