Feature types

This section describes the three features available in OS OpenMap – Local. The attributes associated with these feature types are listed below along with a brief description of their data properties.

Feature type Attribute information

Name and Definition

The name of the attribute and what it is describing.

Attribute Type

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

Length

Values are given here to indicate the maximum length that you will find in the data, to aid in developing applications. Length is not constrained in the GML (Geography Markup Language).

Multiplicity

Describes how many times this element is expected to be populated in the data. An attribute may be optional or mandatory, and it may have multiple occurrences. For example:

• ‘1’ – there must be a value.

• ‘2’ – there must be two values.

• ‘n’ – there may be one or more values.

• ‘0’ – population is optional.

These values may be used in combination.

Association

An association identifies the relationship between features. The relationships are by reference only and the value will be the identifier of the referenced feature.

Not all features available in the product are included in the raster format. For a full list of features and their styling in the raster format, please refer to the product's legend on the OS OpenMap – Local downloads page.