Table 6.312—DRM_Union_Of_Geometry_Topology

Property

Description

Superclass

· <DRM Geometry Topology Hierarchy>

Class

· <DRM Union Of Geometry Topology>

Subclass

· none

Definition

An object of this DRM class specifies a collection of all of the <DRM Geometry Topology> objects that form a complete topological surface.

Example(s)

· A representation of a transportation network might be divided into four rectangular tiles. While the <DRM Line> instances representing roads are allowed to extend across the tile boundaries, the <DRM Geometry Topology> instances that are located within each tile are organized into separate <DRM Union Of Geometry Topology> instances to support access by spatial location.

Inherited field elements

field_name	range	Field_Data_Type
geometry_topology_level		Geometry_Topology_Level

Field elements

field_name	range	Field_Data_Type
none

Associated to (one-way) (inherited)

· none

Associated to (one-way)

· none

Associated by (one-way) (inherited)

· none

Associated by (one-way)

· none

Associated with (two-way) (inherited)

· none

Associated with (two-way)

· none

Composed of (two-way) (inherited)

· none

Composed of (two-way)

· one or more <DRM Geometry Topology>s

Composed of (two-way metadata) (inherited)

· none

Composed of (two-way metadata)

· none

Component of (two-way) (inherited)

· zero or more <DRM Aggregate Geometry>s

Component of (two-way)

· zero or one <DRM Perimeter Related Geometry Topology> through <DRM Perimeter Data>

· zero or one <DRM Spatial Index Related Geometry Topology> through <DRM Spatial Index Data>

Constraints

· Perimeter related organizing principle

Notes

none

Class diagram

<DRM Union Of Geometry Topology>