---
title: "revision(_:supportsConstellation:)"
framework: vision
role: symbol
role_heading: Type Method
path: "vision/vndetectfacelandmarksrequest/revision(_:supportsconstellation:)"
---

# revision(_:supportsConstellation:)

Returns a Boolean value that indicates whether a revision supports a constellation.

## Declaration

```swift
class func revision(_ requestRevision: Int, supportsConstellation constellation: VNRequestFaceLandmarksConstellation) -> Bool
```

## Parameters

- `requestRevision`: The revision of the request.
- `constellation`: The contellation for which to determine support.

## Return Value

Return Value true if the revision supports the constellation, otherwise false.

## See Also

### Identifying Request Revisions

- [VNDetectFaceLandmarksRequestRevision3](vision/vndetectfacelandmarksrequestrevision3.md)
- [VNDetectFaceLandmarksRequestRevision2](vision/vndetectfacelandmarksrequestrevision2.md)
- [VNDetectFaceLandmarksRequestRevision1](vision/vndetectfacelandmarksrequestrevision1.md)