---
title: AVURLAssetShouldSupportAliasDataReferencesKey
framework: avfoundation
role: symbol
role_heading: Global Variable
path: avfoundation/avurlassetshouldsupportaliasdatareferenceskey
---

# AVURLAssetShouldSupportAliasDataReferencesKey

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

## Declaration

```swift
let AVURLAssetShouldSupportAliasDataReferencesKey: String
```

## Discussion

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, the system observes restrictions for resolved alias references like it does for URL references.

## See Also

### Options

- [AVURLAssetAllowsCellularAccessKey](avfoundation/avurlassetallowscellularaccesskey.md)
- [AVURLAssetAllowsConstrainedNetworkAccessKey](avfoundation/avurlassetallowsconstrainednetworkaccesskey.md)
- [AVURLAssetAllowsExpensiveNetworkAccessKey](avfoundation/avurlassetallowsexpensivenetworkaccesskey.md)
- [AVURLAssetHTTPCookiesKey](avfoundation/avurlassethttpcookieskey.md)
- [AVURLAssetHTTPUserAgentKey](avfoundation/avurlassethttpuseragentkey.md)
- [AVURLAssetOverrideMIMETypeKey](avfoundation/avurlassetoverridemimetypekey.md)
- [AVURLAssetPreferPreciseDurationAndTimingKey](avfoundation/avurlassetpreferprecisedurationandtimingkey.md)
- [AVURLAssetPrimarySessionIdentifierKey](avfoundation/avurlassetprimarysessionidentifierkey.md)
- [AVURLAssetReferenceRestrictionsKey](avfoundation/avurlassetreferencerestrictionskey.md)
- [AVURLAssetURLRequestAttributionKey](avfoundation/avurlasseturlrequestattributionkey.md)
- [AVURLAssetShouldParseExternalSphericalTagsKey](avfoundation/avurlassetshouldparseexternalsphericaltagskey.md)