元类机制
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Because there are a few OODBs which support the metaclass mechanism, this methodology has limitation to some degree.
但只有少数的OODBs支持元类机制，因此该方法存在一定的局限性。
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Some instance objects are themselves classes; and all classes are instances of a corresponding metaclass. Even classes only come into existence through the instantiation mechanism.
某些实例对象就是类本身，并且所有的类都是相应元类的实例，甚至类也只能通过实例化机制生成。
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