(*    
      RSL Examples showing how UML syntax is handled.  
      Words in ALLCAPS are the UML terminology for the example shown.
      Written by:  Dan Stearns
      Date:        Fall 1998 CSC 205  

      Modified
       10/28       Added Associaton Class Example
*)  

(*  There is N-N ASSOCIATION between student and section *)

(* This is a user-defined attribute; its primary use is to define
   ASSOCIATION relationships and ASSOCIATION CLASSES *)
define object attribute associates_with: Enrollment;
                                    -- ^^^^^^^^^^^^
-- The association_class attribute is no longer needed.
-- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

object Section
  components:  number:string and quarter:number and Course and inst:string;
  associates_with:  Students;  -- no more association_class attribute here
                               -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  operations:  (* *);
  description: (* number, quarter and inst are ATTRIBUTES
                  Course is an AGGREGRATE
                  associates_with defines an ASSOCIATION relationship
                  Enrollment defines an ASSOCIATION Class
               -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                      with attributes related to the association
                *);
end Section;
(* Shorthand if no components nor operations defined *)
object Sections = Section*;

object Enrollment
  components: grade:string; 
  -- No more associates_with needed here
  -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  operations: (* *);
  description: (* Enrollment is an ASSOCIATION CLASS that defines the
                  attributes of an association between two other classes.
               *);
end Enrollment;

object Student
  components:  Name:string and Id:number and Major:string;
  associates_with:  Sections;  -- no more association_class attribute here
                               -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  operations:  (* *);
  description: (* Student is a SUPER CLASS - a general 
                  template of which other types may be defined *);
end Student;
(* Shorthand if no components nor operations defined *)
object Students = Student*;

object Course; -- Just a place holder