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# Media entity property keys

The property keys used to retrieve metadata for media entities.

## Discussion

You obtain metadata for a media entity by calling the [`value(forProperty:)`](/documentation/MediaPlayer/MPMediaEntity/value(forProperty:)) method with these property keys. You can also use some properties to build media property predicates, as described in [`MPMediaPropertyPredicate`](/documentation/MediaPlayer/MPMediaPropertyPredicate). These properties are filterable.

## Topics

### Constants

[`MPMediaEntityPropertyPersistentID`](/documentation/MediaPlayer/MPMediaEntityPropertyPersistentID)

The persistent identifier for a media entity.


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