> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles.md). # AddressBase Core Principles The following AddressBase core principles pages provide an overview of the 'family' of AddressBase products. They cover core elements of design for AddressBase products, including data formats, coordinate reference systems, currency, precision, and data sources, amongst other topics. * [Release notes](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/release-notes.md) * [AddressBase product family](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/addressbase-product-family.md) * [Future and past publication dates](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/future-and-past-publication-dates.md) * [Unique Property Reference Number (UPRN)](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/unique-property-reference-number-uprn.md) * [Coordinate reference systems](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/coordinate-reference-systems.md) * [Classification scheme](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/classification-scheme.md) * [Data sources](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/data-sources.md) * [Street names and numbering](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/street-names-and-numbering.md) * [Currency, completeness and precision](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/currency-completeness-and-precision.md) * [Product supply](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/product-supply.md) * [Code lists and enumerations](/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles/code-lists-and-enumerations.md) These pages should be used in conjunction with the detailed technical specifications for each product (which can be found under the top-level product guide page for each individual product from the left-hand-side menu). --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.os.uk/os-downloads/~/changes/AJZwzCsyrD9hiTbOxIbO/addressing-and-location/addressbase-core-principles.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.