As of ooRexx 3.1.2 class instances have a method IsInstanceOf to find out if they are a subclass of some class.
Sometimes it is neccessary to find out if a class inherits from other classes. This is impossible to check with the IsInstanceOf method, as this asks for an instance, not a class.
A solution for this would be to add a class method IsSubclassOf(class).
The problem can be avoided by using
but that is not very nice.