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# PersistentIdentifier

A type that describes the aggregate identity of a SwiftData model.

```
struct PersistentIdentifier
```

## Overview> Note: Decoded ``doc://com.apple.SwiftData/documentation/SwiftData/PersistentIdentifier`` and identifiers created by the ``doc://com.apple.SwiftData/documentation/SwiftData/DefaultStore`` are not considered equivalent.

## Topics

### Accessing identity information

[`id`](/documentation/SwiftData/PersistentIdentifier/id-swift.property)

The value that uniquely identifies the associated model within the containing store.

[`PersistentIdentifier.ID`](/documentation/SwiftData/PersistentIdentifier/ID-swift.struct)

A type that represents the stable identity of a SwiftData model.

[`storeIdentifier`](/documentation/SwiftData/PersistentIdentifier/storeIdentifier)

The identifier of the store that contains the associated model.

[`entityName`](/documentation/SwiftData/PersistentIdentifier/entityName)

The entity name for the associated model.

### Encoding and decoding

### Hashing

### Comparing identifiers


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