The objects are of different types according to their extension in space: point, line, surface and body like objects. These are called the geometrical types of the objects, shortly object types. In the database DAT occure the list three. Their definition is as follows:
Of point objects the data model DAT distinguishes real object point (e.g. triangulation point), surface point (e.g. geocode), and label point (e.g. pricking spot of a geographical name).
Among the geometrical types of objects it is also possible another kind of classification: simple and complex objects. The latter come into being by somewhat linking of simple (point, line and surface) objects.
Hierarchy of building relationship between simple and complex objects
EOi - Simple objects
KOi - Complex objects
KO - Multiple complex objects