---
title: IODataQueueAppendix
framework: IOKit
role: symbol
role_heading: Type Alias
platforms: [iOS 16.0+, iPadOS 16.0+, Mac Catalyst 13.0+, macOS 10.5+, visionOS 1.0+]
path: iokit/iodataqueueappendix
---

# IODataQueueAppendix

A struct mapping to the appendix region of a data queue.

## Declaration

```swift
typealias IODataQueueAppendix = _IODataQueueAppendix
```

## Discussion

Discussion This struct is variable sized dependent on the version. The struct represents the data queue appendix information.