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Both macros create a block of code in which simple variable names can be
used to refer to slots on a particular object.
At the minimum, a slot specifier names the slot, in which case
the slot specifier can be just a name. On the other
hand, :initargs needn't be exclusive--each :initarg option in a slot specifier creates a keyword parameter that can be used to initialize the slot; multiple
parameters don't create a conflict, so the new slot specifier contains all the
:initargs. The &key in the parameter list is required
to keep the method's parameter list congruent with the generic function's--the parameter list specified for the INITIALIZE-INSTANCE generic function includes &key
in order to allow individual methods to supply their own keyword parameters but
doesn't require any particular ones. Java in which all the
methods of a class must be defined as part of the class definition. Common Lisp also supports multiple inheritance--a class
can have multiple direct superclasses, inheriting applicable methods and slot specifiers from all of them.
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