# Code lists A code list or enumeration is a controlled set of values which can be used to populate a specific column. The following pages define code lists that make up the Points of Interest product: * [Positional Accuracy](/os-downloads/products/addresses-and-names-portfolio/points-of-interest/points-of-interest-technical-specification/code-lists/positional-accuracy.md) * [Match Indication](/os-downloads/products/addresses-and-names-portfolio/points-of-interest/points-of-interest-technical-specification/code-lists/match-indicator.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/points-of-interest/points-of-interest-technical-specification/code-lists.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.