<!--
{
  "availability" : [
    "iOS: 4.0.0 - 16.0.0",
    "iPadOS: 4.0.0 - 16.0.0",
    "macCatalyst: 13.1.0 - 16.0.0",
    "macOS: 10.7.0 - 13.0.0",
    "tvOS: 9.0.0 - 16.0.0",
    "visionOS: 1.0.0 - 1.0.0",
    "watchOS: 1.0.0 - 9.0.0"
  ],
  "documentType" : "symbol",
  "framework" : "AVFoundation",
  "identifier" : "/documentation/AVFoundation/AVMetadataItem/extraAttributes",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "AVFoundation"
    ],
    "preciseIdentifier" : "c:objc(cs)AVMetadataItem(py)extraAttributes"
  },
  "title" : "extraAttributes"
}
-->

# extraAttributes

A dictionary of additional attributes for a metadata item.

```
var extraAttributes: [AVMetadataExtraAttributeKey : Any]? { get }
```

## Discussion

Extra attributes, when they’re present, are specific to metadata container formats and keys in their associated key-spaces. For example, a metadata item can represent the “attached picture” frame defined by the ID3 tag specification with keyspace [`id3`](/documentation/AVFoundation/AVMetadataKeySpace/id3) and key [`id3MetadataKeyAttachedPicture`](/documentation/AVFoundation/AVMetadataKey/id3MetadataKeyAttachedPicture), a value that carries the image data, and extra attributes that include a description of the picture as carried in the ‘APIC’ frame of the ID3 tag.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)