| 21. | Because different classes can have different sets of class methods, each class must have its own separate metaclass.
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| 22. | The explicit metaclass support in ObjVlisp influenced the provision of the same capability in the Common Lisp Object System.
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| 23. | In UML 2 . x, a powertype is a metaclass whose instances are subclasses of a given class.
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| 24. | ObjVlisp provided a far more flexible metaclass model than that provided by earlier object-oriented languages, especially Smalltalk.
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| 25. | In the Semantic Web, a "'metaclass "'is a class whose instances are classes.
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| 26. | This enables knowledge about instances of those metaclasses to be inferred by semantic reasoners using statements made in the metaclass.
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| 27. | Powertype ( UML ) and " singleton class " seems to exists in literature in the metaclass context.
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| 28. | Because of this, many objects in Inform do not inherit from any class, other than the " metaclass " Object.
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| 29. | In turn, the class Car is again an object and as such an instance of the metaclass of Car called Car class.
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| 30. | Since there is no requirement that metaclasses behave differently from each other, all metaclasses are instances of only one class called Metaclass.
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