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# extendedLanguageTag

The language tag of the track.

```
static var extendedLanguageTag: AVAsyncProperty<Root, String?> { get }
```

## Discussion

Use the [`load(_:isolation:)`](/documentation/AVFoundation/AVAsynchronousKeyValueLoading/load(_:isolation:)) method to retrieve the property value.

The value is a [BCP-47](https://tools.ietf.org/html/bcp47) language tag, or `nil` if the track doesn’t specify a language tag.

---

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