---
title: Internal symbols
framework: swiftdata
role: collectionGroup
role_heading: API Collection
path: swiftdata/persistentmodelinternal
---

# Internal symbols

Restricted-use symbols that the framework requires for macro expansion and other internal tasks.

## Overview

Overview important: Don’t use these restricted symbols directly. The framework depends on the symbols for macro expansion and other nonpublic tasks.

## Topics

### Storage

- [BackingData](swiftdata/backingdata.md)