| M.O wrote: Suppose that I am in this situation:
|
|  class A
|  class B subClassOf A
|  class C subClassOf A
|  class D subClassOf C
|
|  ...what can I do in order to obtain only the classes B and D? In other
|  words is there a way to retrieve only the leaf classes of a hierarchy tree?
|
| IBL wrote : Here is one way of expressing this.
|
|   You can run (and change) this example using a browser with
|   the Internet Business Logic system  at www.reengineeringllc.com .



the top level class is some-top-class
some-class is a subclass of that-top-class
not : that-class has at least one subclass
------------------------------------------------
that-class is a leaf class of the hierarchy tree


the top level class is this-class
==================================
                         A


some-class2 is a subclass of some-class3 
some-class1 is a subclass of that-class2
----------------------------------------
that-class1 is a subclass of that-class3


some-subclass is a subclass of some-class
-----------------------------------------
that-class has at least one subclass


this-class1 is a subclass of this-class2 
========================================
  B                          A
  C                          A
  D                          C