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# ContactProviderDomain

A domain, including traits like an identifier and display name, used to configure the extension.

```
protocol ContactProviderDomain
```

## Topics

### Identifying the domain

[`var displayName: String`](/documentation/ContactProvider/ContactProviderDomain/displayName)

The display name the system shows to represent this domain.

[`var identifier: String`](/documentation/ContactProvider/ContactProviderDomain/identifier)

The identifier of the domain.

### Providing custom domain data

[`var userInfo: [String : Any]`](/documentation/ContactProvider/ContactProviderDomain/userInfo)

Custom values used to configure the extension before enumeration begins.

## Relationships

### Conforming Types

[`DefaultContactProviderDomain`](/documentation/ContactProvider/DefaultContactProviderDomain)

---

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