# AddressBase Plus Islands Technical Specification

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This product was designed to allow current customers of AddressBase Plus to add this product (AddressBase Plus Islands) to their current data holdings. This means there are columns in the schema of this product which will never be populated. These are identified on the appropriate pages throughout this specification document.
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This technical specification includes the following sections:

* [Data formats](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-plus-islands/addressbase-plus-islands-technical-specification/data-formats)
* [Supply and update](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-plus-islands/addressbase-plus-islands-technical-specification/supply-and-update)
* [AddressBase Plus Islands structure](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-premium-islands/addressbase-premium-islands-technical-specification/addressbase-premium-islands-structure)
* [Feature types](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-plus-islands/addressbase-plus-islands-technical-specification/feature-types)
* [Code lists and enumerations](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-plus-islands/addressbase-plus-islands-technical-specification/code-lists-and-enumeration)
* [CSV to GML mapping](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-plus-islands/addressbase-plus-islands-technical-specification/csv-to-gml-mapping)
* [Example records](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-plus-islands/addressbase-plus-islands-technical-specification/example-records)

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All AddressBase products include the [Unique Property Reference Number (UPRN)](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/unique-property-reference-number-uprn) and are based on same [coordinate reference systems](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/coordinate-reference-systems). 

Please see the [General AddressBase information](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles) section for additional information that applies across all AddressBase products.
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