Invoking Inititalizers

  In the init() method of a multiply inherited class, it is usually
  necessary to invoke the initializers of all direct parent classes. Since
  the METHOD definition command only allows a single parent initializer
  to be invoked, it is best to invoke parent initializers explicitly. For
  example, assume a class is multiply inherited from two classes, x and y.
  The init method in the subclass should then look something like this:

    METHOD init(...)
       ::x:init(...)
       ::y:init(...)
       //...
    RETURN self

  This makes use of scope resolution messages to invoke the correct method
  in the specified parent class. Scope resolution messages are discussed
  further in the following sections.