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# ALAssetPropertyAssetURL

The key to retrieve a URL identifier for the asset.

```
extern NSString * const ALAssetPropertyAssetURL;
```

## Discussion

The corresponding value is an <doc://com.apple.documentation/documentation/Foundation/NSURL> object.

This URL is used by the library-change notifications to identify assets and asset groups. Only the [`ALAssetRepresentation`](/documentation/AssetsLibrary/ALAssetRepresentation) and [`ALAssetsGroup`](/documentation/AssetsLibrary/ALAssetsGroup) classes support this property.

---

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