> 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/areas-and-zones-portfolio/boundary-line/boundary-line-technical-specification/shapefile-tab-and-gkpg/features-shapefile-tab-and-gpkg.md).

# Features - Shapefile, TAB and GPKG

{% hint style="info" %}
This section details the features for ESRI Shapefile, MapInfo TAB and GeoPackage only. Please see [GML](/os-downloads/products/areas-and-zones-portfolio/boundary-line/boundary-line-technical-specification/gml.md) and [Vector Tile](/os-downloads/products/areas-and-zones-portfolio/boundary-line/boundary-line-technical-specification/vector-tiles.md) for information about working with these formats.
{% endhint %}

## Boundary-Line features

This section describes the features for ESRI shapefile, MapInfo TAB and GeoPackage which make up the Boundary-Line product, giving the following information about each attribute:

### Name and Definition

The name of the attribute and what it is describing.

### Condition

A condition associated with the 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 Boundary-Line product. These are denoted by:

* ‘1’ – Mandatory – There must be a value.
* ‘0..1’ – Optional – If populated, a maximum of one attribute will be returned.

These values may be used in combination.


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