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          Calss Sortable


     The first abstract class consists of the class  of  objects which
     are  sortable.  Membership  in  this  class is limited  to  those
     objects that can be tested for order. You can derive objects from
     it and place these derived objects into ordered collections, such
     as  trees.  An  object which has  been  derived  from  the  class
     Sortable must define isLessThan, in addition  to  those functions
     required of the class  Object.  (Remember  that class Sortable is
     derived from class Object and therefore  inherits  the properties
     of that class.)

     Derived from: Object

     Public member functions:
            isSortable
            isLessThan
            isA              Inherited from Object
            nameOf           Inherited from Object.
            isEqual          Inherited from Object.
            hashValue        Inherited from Object.
            isAssociation    Inherited from Object.
            operator new     Inherited from Object.
            forEach          Inherited from Object.
            firstThat        Inherited from Object.
            lastThat         Inherited from Object.
            printOn          Inherited from Object.