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# identifier

The string that represents the type.

```
var identifier: String { get }
```

## Discussion

The identifier uniquely identifies its type, represented by a reverse-DNS string, such as `public.jpeg` or `com.adobe.pdf`.

API that doesn’t use [`UTType`](/documentation/UniformTypeIdentifiers/UTType-swift.struct) uses a `String` or <doc://com.apple.documentation/documentation/CoreFoundation/CFString> to refer to a type by its identifier.

---

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