> 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/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-technical-specification/feature-types.md).

# Feature types

This section describes the feature types (one for CSV and GeoPackage, and two for GML) which make up the AddressBase Premium product, giving the following information about each attribute.

## AddressBase Premium attribute information

### **Name and Definition**

The name of the attribute and what it is describing.

### **Condition**

A condition associated with this attribute (optional).

### **Attribute Type**

The nature of the attribute, for example, a numeric value or a code list value.

### **Multiplicity**

Describes how many times this element is expected to be populated in the data. An attribute may be optional or mandatory within the product. These are denoted by:

* ‘1’ – there must be a value
* ‘0..1’ – population is optional but a maximum of one attribute will be returned These values may be used in combination.

## AddressBase Premium feature types

* [Street – (Type 11 Record)](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-technical-specification/feature-types/street-type-11-record.md)
* [BLPU – (Type 21 Record)](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-technical-specification/feature-types/blpu-type-21-record.md)
* [AddressBase supply set](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-technical-specification/feature-types/addressbase-supply-set.md)
* [Feature with lifecycle](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-technical-specification/feature-types/feature-with-lifecycle.md)


---

# 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/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-technical-specification/feature-types.md?ask=<question>&goal=<user_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.