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 ANSI Common Lisp    7 Objects    7.3 Reinitializing an Instance
7.3.1   Customizing Reinitialization
Methods for reinitialize-instance may be defined to specify
actions to be taken when an instance is updated.  If only
after methods for reinitialize-instance are defined, 
they will be run after the system-supplied primary method for 
initialization and therefore will not interfere with the default behavior of 
reinitialize-instance.
Methods for shared-initialize may be defined to customize 
class redefinition.  For more information, see Section 7.1.5 Shared-Initialize.
 
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