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# ExtensionPointDefining

An interface that extension point types adopt.

```
protocol ExtensionPointDefining
```

## Overview

The <doc://com.apple.documentation/documentation/ExtensionFoundation> framework uses this
protocol to identify types that represent extension points.

## Relationships

### Conforming Types

[`AppExtensionPoint`](/documentation/ExtensionFoundation/AppExtensionPoint)

---

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