---
title: revision
framework: Natural Language
role: symbol
role_heading: Type Property
platforms: [iOS 12.0+, iPadOS 12.0+, Mac Catalyst 13.0+, macOS 10.14+, tvOS 12.0+, visionOS 1.0+, watchOS 5.0+]
path: naturallanguage/nlcontextualembeddingkey/revision
---

# revision

A key that identifies the version number the contextual embedding uses.

## Declaration

```swift
static let revision: NLContextualEmbeddingKey
```

## See Also

### Getting embedding keys

- [languages](naturallanguage/nlcontextualembeddingkey/languages.md)
- [scripts](naturallanguage/nlcontextualembeddingkey/scripts.md)