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# FxVersioningAPI

A collection of methods that a host application implements to identify the plug-in version used by a project when it was first created.

```
protocol FxVersioningAPI
```

## Overview

This protocol allows a plug-in instance to determine the version of the original instance of the plug-in. For example, if a user creates a project using version 1 of a plug-in, and then updates to version 2, the plug-in determines the old plug-in version and chooses which version to render.

This protocol was first introduced in FxPlug SDK 1.2.1.

## Topics

### Getting and Modifying Plug-in Version Numbers

[`versionAtCreation()`](/documentation/professional_video_applications/FxVersioningAPI/versionAtCreation())

Provides the version number of a plug-in that a project uses.

[`updateVersion(atCreation:)`](/documentation/professional_video_applications/FxVersioningAPI/updateVersion(atCreation:))

Updates the version of the plug-in that was stored when the plug-in was added to the clip.


---

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