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# NSMigrationStage

An abstract base class for describing an individual stage of a migration.

```
class NSMigrationStage
```

## Overview> Important:
> Don’t create instances of ``doc://com.apple.coredata/documentation/CoreData/NSMigrationStage``. Instead, use a concrete subclass, such as ``doc://com.apple.coredata/documentation/CoreData/NSLightweightMigrationStage`` or ``doc://com.apple.coredata/documentation/CoreData/NSCustomMigrationStage``.

## Topics

### Describing the purpose

[`label`](/documentation/CoreData/NSMigrationStage/label)

The textual description of the migration stage’s purpose.

## Relationships

### Conforms To

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`Hashable`](/documentation/Swift/Hashable)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Equatable`](/documentation/Swift/Equatable)

[`CVarArg`](/documentation/Swift/CVarArg)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

### Inherited By

[`NSCustomMigrationStage`](/documentation/CoreData/NSCustomMigrationStage)

[`NSLightweightMigrationStage`](/documentation/CoreData/NSLightweightMigrationStage)

---

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