Feature type

This section describes the single feature type that makes up the OS MasterMap Topography Layer – Building Height Attribute product. The Building Height Attribute feature type has 10 attributes. The following information is given about each attribute:

Attribute Name and Definition

The name of the attribute and what it is describing.

Attribute Type

The nature of the attribute. The following values may occur:

Type	Description
Date	Specifies a day within the Gregorian calendar in the format YYYY-MM-DD.
Integer	Any positive or negative whole number or zero.
Real	A floating point number.
CharacterString	An ordered set of characters.

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 as denoted by the following:

• [1] indicates that the attribute is mandatory and can only occur once.

• [0..1] indicates that the attribute is optional; if present, it only occurs once.