---
title: ExtensionPointDefining
framework: extensionfoundation
role: symbol
role_heading: Protocol
path: extensionfoundation/extensionpointdefining
---

# ExtensionPointDefining

An interface that extension point types adopt.

## Declaration

```swift
protocol ExtensionPointDefining
```

## Overview

Overview The ExtensionFoundation framework uses this protocol to identify types that represent extension points.

## Relationships

### Conforming Types

- [AppExtensionPoint](extensionfoundation/appextensionpoint.md)

## See Also

### Extension-point management

- [AppExtensionPoint](extensionfoundation/appextensionpoint.md)