Syntax:
add-direct-subclass (superclass class) (subclass class)> => unspecified
Description:
This is a method on the generic function add-direct-subclass.
No behavior is specified for this method beyond that which is specified for the generic function.
This method cannot be overridden unless the following methods are overridden as well:
| remove-direct-subclass class class |
| class-direct-subclasses class |