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# Schema

An object that maps model classes to data in the model store, and helps with the migration of that data
between releases.

```
final class Schema
```

## Topics

### Creating a schema

[`init(_:version:)`](/documentation/SwiftData/Schema/init(_:version:)-8el78)

[`init(_:version:)`](/documentation/SwiftData/Schema/init(_:version:)-8jo9o)

[`init(versionedSchema:)`](/documentation/SwiftData/Schema/init(versionedSchema:))

[`VersionedSchema`](/documentation/SwiftData/VersionedSchema)

An interface for describing a specific version of a schema, including the models it contains.

[`init()`](/documentation/SwiftData/Schema/init())

[Schema components](/documentation/SwiftData/SchemaComponents)

Specify the constituent parts of your schema, including entities, attributes,
and relationships.

### Accessing entities

[`entities`](/documentation/SwiftData/Schema/entities)

[`entitiesByName`](/documentation/SwiftData/Schema/entitiesByName)

[`Schema.Entity`](/documentation/SwiftData/Schema/Entity)

An object that provides a blueprint for the associated model class.

### Accessing version details

[`schemaEncodingVersion`](/documentation/SwiftData/Schema/schemaEncodingVersion)

[`encodingVersion`](/documentation/SwiftData/Schema/encodingVersion)

### Saving and loading

[`save(to:)`](/documentation/SwiftData/Schema/save(to:))

[`load(from:)`](/documentation/SwiftData/Schema/load(from:))

### Encoding and decoding

### Hashing

### Comparing schemas


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