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## 5.1.1.2 Abstract classes
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_Restrictions_
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| rule | text | conformance |
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| ------ | ------ | :------: |
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|a| Abstract classes cannot be explicitly instantiated. ||
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|b| If a class that is not declared abstract extends an abstract class, all methods, property getters and setters that have no implementation in the superclass shall be implemented in this class.||
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## 5.1.1.3 External classes
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## 5.1.1.4 Final classes
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