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# ARSession.CollaborationData.Priority.critical

A priority that indicates that collaboration depends on this data.

```
case critical
```

## Discussion

ARKit sets the data [`priority`](/documentation/ARKit/ARSession/CollaborationData/priority-swift.property) to  [`ARSession.CollaborationData.Priority.critical`](/documentation/ARKit/ARSession/CollaborationData/Priority-swift.enum/critical)  when it’s needed to establish or continue a collaborative session.

---

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