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# isAbstract

A Boolean value that indicates whether the receiver represents an abstract entity.

```
var isAbstract: Bool { get set }
```

## Return Value

<doc://com.apple.documentation/documentation/Swift/true> if the receiver represents an abstract entity, otherwise <doc://com.apple.documentation/documentation/Swift/false>.

## Discussion

<doc://com.apple.documentation/documentation/Swift/true> if the receiver represents an abstract entity, otherwise <doc://com.apple.documentation/documentation/Swift/false>. An abstract entity might be Shape, with concrete sub-entities such as Rectangle, Triangle, and Circle.

### Special Considerations

Setting whether an entity is abstract raises an exception if the receiver’s model has been used by an object graph manager.

---

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