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# providerIdentifier

An identifier shared by this Document Picker extension and its corresponding File Provider extension. (read-only)

```
var providerIdentifier: String { get }
```

## Discussion

Both the Document Picker View Controller extension and the File Provider extension should pass this identifier to their file coordinator’s `setPurposeIdentifier:` method. This approach helps coordinate the read and write operations between the two extensions, preventing possible deadlocks.

This property holds the value returned by calling the File Provider extension’s <doc://com.apple.documentation/documentation/FileProvider/NSFileProviderExtension/providerIdentifier> method.

---

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