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CLHS: Section 4.3.1.1
CLHS: Section 4.3.1.1 4.3.1.1 Standard Metaclasses
The object system provides a number of predefined metaclasses. These include the classes standard-class, built-in-class, and structure-class:
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* The class standard-class is the default class of classes defined by defclass.
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* The class built-in-class is the class whose instances are classes that have special implementations with restricted capabilities. Any class that corresponds to a standard type might be an instance of built-in-class. The predefined type specifiers that are required to have corresponding classes are listed in Figure 4-8. It is implementation-dependent whether each of these classes is implemented as a built-in class.
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* All classes defined by means of defstruct are instances of the class structure-class.
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