# Code lists and enumeration

A code list or enumeration is a controlled set of values which can be used to populate a specific column. The code list and enumeration UML models associated with AddressBase Plus Islands can be found below, with their appropriate descriptions.

<figure><img src="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2FZiVlJLqkzzb7PIfJCYRn%2F4.jpeg?alt=media" alt="Diagram showing the descriptions of the enumerations and code lists that comprise the AddressBase Plus Islands product."><figcaption><p>Diagram showing the descriptions of the enumerations and code lists that comprise the AddressBase Plus Islands product.</p></figcaption></figure>

## AddressBase Plus code list and enumerations

* [RPCCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/rpccode)
* [StateCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/statecode)
* [LanguageCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/languagecode)
* [PostcodeTypeCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/postcodetypecode)
* [OfficalFlagCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/officialflagcode)
* [ChangeTypeCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/changetypecode)
* [USRNMatchIndicatorCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/usrnmatchindicatorcode)
* [AddressbasePostalCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/addressbasepostalcode)
* [CountryCode](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations/countrycode)