---
title: NSWhoseSpecifier.SubelementIdentifier
framework: foundation
role: symbol
role_heading: Enumeration
path: foundation/nswhosespecifier/subelementidentifier
---

# NSWhoseSpecifier.SubelementIdentifier

NSWhoseSpecifier uses these constants to specify sub-elements within the collection of objects being tested that pass the specifier’s test.

## Declaration

```swift
enum SubelementIdentifier
```

## Overview

Overview These constants are used by startSubelementIdentifier, startSubelementIdentifier, endSubelementIdentifier, and endSubelementIdentifier.

## Topics

### Constants

- [NSWhoseSpecifier.SubelementIdentifier.indexSubelement](foundation/nswhosespecifier/subelementidentifier/indexsubelement.md)
- [NSWhoseSpecifier.SubelementIdentifier.everySubelement](foundation/nswhosespecifier/subelementidentifier/everysubelement.md)
- [NSWhoseSpecifier.SubelementIdentifier.middleSubelement](foundation/nswhosespecifier/subelementidentifier/middlesubelement.md)
- [NSWhoseSpecifier.SubelementIdentifier.randomSubelement](foundation/nswhosespecifier/subelementidentifier/randomsubelement.md)
- [NSWhoseSpecifier.SubelementIdentifier.noSubelement](foundation/nswhosespecifier/subelementidentifier/nosubelement.md)

### Initializers

- [init(rawValue:)](foundation/nswhosespecifier/subelementidentifier/init(rawvalue:).md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)