Table 6.308—DRM_Union_Of_Feature_Topology

Property

Description

Superclass

· <DRM SEDRIS Abstract Base>

Class

· <DRM Union Of Feature Topology>

Subclass

· none

Definition

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

Example(s)

· A thematic layer representing a transportation network might be broken up into 4 rectangular tiles. While the <DRM Linear Feature>s representing roads are allowed to extend across the tile boundaries, the <DRM Feature Topology> objects that are located within each tile are organized into separate <DRM Union Of Feature Topology> objects to support access by geographic location.

Inherited field elements

field_name	range	Field_Data_Type
feature_topology_level		Feature_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 Feature 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 Feature>s

Component of (two-way)

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

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

Constraints

· Perimeter related organizing principle

Notes

none

Class diagram

<DRM Union Of Feature Topology>