---
title: SpeechXtndData
framework: applicationservices
role: symbol
role_heading: Structure
path: applicationservices/speechxtnddata
---

# SpeechXtndData

Defines a speech extension data structure.

## Declaration

```swift
struct SpeechXtndData
```

## Overview

Overview The speech extension data structure allows you to use the GetSpeechInfo and SetSpeechInfo functions with selectors defined by particular synthesizers. By requiring that you pass to one of these functions a pointer to a speech extension data structure, synthesizers can permit the exchange of data in any format.

## Topics

### Initializers

- [init()](applicationservices/speechxtnddata/1459302-init.md)
- [init(synthCreator:synthData:)](applicationservices/speechxtnddata/1461482-init.md)

### Instance Properties

- [synthCreator](applicationservices/speechxtnddata/1462619-synthcreator.md)
- [synthData](applicationservices/speechxtnddata/1459201-synthdata.md)