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# AlbumFilter

Album properties your app uses as a filter for a catalog resource request.

```
protocol AlbumFilter
```

## Topics

### Instance Properties

[`var id: MusicItemID`](/documentation/MusicKit/AlbumFilter/id)

The unique identifier for the album.

[`var upc: String?`](/documentation/MusicKit/AlbumFilter/upc)

The universal product code (UPC) for the album.

---

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