---
title: "identifier(forKey:keySpace:)"
framework: avfoundation
role: symbol
role_heading: Type Method
path: "avfoundation/avmetadataitem/identifier(forkey:keyspace:)"
---

# identifier(forKey:keySpace:)

Returns a metadata identifier for the specified key and key space.

## Declaration

```swift
class func identifier(forKey key: Any, keySpace: AVMetadataKeySpace) -> AVMetadataIdentifier?
```

## Parameters

- `key`: A key to return an identifier for.
- `keySpace`: A key space to return an identifier for.

## Return Value

Return Value A metadata identifier, or nil if no equivalent identifier exists.

## See Also

### Translating metadata items

- [key(forIdentifier:)](avfoundation/avmetadataitem/key(foridentifier:).md)
- [keySpace(forIdentifier:)](avfoundation/avmetadataitem/keyspace(foridentifier:).md)