# AddressBase Premium Islands Technical Specification The AddressBase Premium Islands product contains Local Authority, Ordnance Survey and Royal Mail addresses. This includes provisional addresses (proposed planning developments) and historic information (demolished properties), where available. Ordnance Survey addresses are added to the AddressBase Premium Islands product where necessary to ensure the schema meets the core AddressBase products. {% hint style="info" %} This product was designed to allow current customers of AddressBase Premium to add this product (AddressBase Premium 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. {% endhint %} ## Index * [Data formats](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/data-formats.md) * [Supply and update](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/supply-and-update.md) * [AddressBase Premium structure](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-technical-specification/addressbase-premium-structure.md) * [Feature types](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/feature-types.md) * [Structured data types](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/structured-data-types.md) * [Dataset metadata](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/dataset-metadata.md) * [Code lists and enumerations](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/code-lists-and-enumerations.md) * [Attribute names format comparison](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/attribute-format-comparison.md) * [Example records](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification/example-records.md) ## AddressBase fundamentals Additional documentation covering the complete family of AddressBase products is available in the AddressBase Fundamentals pages. These covers key elements of design for AddressBase products, including: * [Future and past publication dates](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/future-and-past-publication-dates.md) * [Unique Property Reference Number (UPRN)](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/unique-property-reference-number-uprn.md) * [Coordinate reference systems](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/coordinate-reference-systems.md) * [Classification scheme](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/classification-scheme.md) * [Data sources](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/data-sources.md) * [Street names and numbering](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/street-names-and-numbering.md) * [Currency completeness and precision](/os-downloads/products/addresses-and-names-portfolio/addressbase-core/addressbase-core-overview/currency-completeness-and-precision.md) * [Product supply](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/product-supply.md) * [AddressBase local custodian codes](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/addressbase-local-custodian-codes.md) * [AddressBase Islands local custodian codes](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/addressbase-islands-local-custodian-codes.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-premium-islands/addressbase-premium-islands-technical-specification.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.