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# isValid

A Boolean value indicating whether this object is valid.

```
var isValid: Bool { get }
```

## Discussion

An object’s validity is connected to a [`USDStage`](/documentation/USDKit/USDStage). An object becomes
invalid when the lifetime of its stage ends.

An object will also expire if its stage no longer defines a value for
the object. `isValid` is false if this object has expired.

---

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