---
title: USDStage.ObservationToken
framework: usdkit
role: symbol
role_heading: Structure
path: usdkit/usdstage-4sfi1/observationtoken
---

# USDStage.ObservationToken

## Declaration

```swift
struct ObservationToken
```

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Observing changes

- [addObserver(for:using:)](usdkit/usdstage-4sfi1/addobserver(for:using:).md)
- [USDStage.Notice](usdkit/usdstage-4sfi1/notice.md)
- [USDStage.ObjectsDidChange](usdkit/usdstage-4sfi1/objectsdidchange.md)