A class is defined using the following call:

(defclass class (supers)
	  (slot-specs)
	  class-options)

An example of a call to defclass is:

(defclass xyvector (vector)
  ((x :initarg :x :initform 0)
   (y :initarg :y :initform 0))
  (:documentation "A simple x-y vector"))

defclass is a macro; it calls the function defclass-expr with its arguments un-evaluated.

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