Classifier::isAbstract : Boolean [1..1] If true, the Classifier can only be instantiated by instantiating one of its specializations. An abstract Classifier is intended to be used by other Classifiers e.g., as the target of Associations or Generalizations

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Block, Generalization, Association: Home entertainment system
If an abstract Block or Class in a domain model has Associations to Blocks or Classes that are not also abstract, it's often a hint that you have not identified a correct abstraction layer.
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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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Classifier::isAbstract
Classifier
Class
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isAbstract : Boolean [1..1] = false

If true, the Classifier can only be instantiated by instantiating one of its specializations. An abstract Classifier is intended to be used by other Classifiers e.g., as the target of Associations or Generalizations.

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