# Enumerations

A code list or enumeration is a controlled set of values which can be used to populate a specific column. 

## AddressBase Core enumerations

* [RPCCode](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/code-lists-and-enumerations/rpccode)
* [ChangeTypeCode](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/code-lists-and-enumerations/changetypecode)