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# extendedLanguageTag

A string that indicates the language tag associated with the track, as an IETF BCP 47 (RFC 4646) language identifier.

```
var extendedLanguageTag: String? { get set }
```

## Discussion

`MediaToolbox` uses this property to group similar language tracks together or to match audio and caption tracks. Set this value to `nil` if the track doesn’t have a language tag.

---

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