Defining Methods  Methods are defined using the call:          
(defmethod selector (args) code)  where selector is the name of
the message, (args) is a list of the arguments of the method,
and code is the Lisp code that implements the method.  A method
is actually a special form of function definition. It looks
almost like a function definition, except that (args) has a
special form. Each argument may be either a variable name, or a
list (variable class) to declare the class (type) of the
variable.  An example method definition is:  (defmethod area
((self circle))   (* pi (expt (sendm self 'radius) 2)) )  This
becomes:  (defun circle-area (self)  Contents    Page-10   
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