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# AVURLAssetShouldSupportAliasDataReferencesKey

A Boolean value that indicates whether the system parses and resolves alias data references in the asset.

```
let AVURLAssetShouldSupportAliasDataReferencesKey: String
```

## Discussion

Most QuickTime movie files contain all of the media data they require, but some contain references to media in other files. While AVFoundation and CoreMedia typically employ a URL reference for this purpose, older implementations commonly use a Macintosh alias instead, as the QuickTime File Format specification documents. Specify this option if your app must work with legacy QuickTime movie files that contain alias-based references to media data in other files.

If you provide a value for [`AVURLAssetReferenceRestrictionsKey`](/documentation/AVFoundation/AVURLAssetReferenceRestrictionsKey), the system observes restrictions for resolved alias references like it does for URL references.

---

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