Abstract Class Name: Feature Topology

Superclass - <SEDRIS Abstract Base>

Subclasses

• <Feature Edge>
• <Feature Face>
• <Feature Node>
• <Feature Volume>

Definition

An instance of this DRM class specifies both the geometric aspects (such as location and shape) and topological aspects (such as adjacency) of part of one or more <Feature Representation> instances.

Primary Page in DRM Diagram:

• 12

Secondary Pages in DRM Diagram:

• 11
• 23

Example

1. In a collection of <Feature Representation> instances representing a transportation network, the <Feature Face> instances represent built-up areas, airfields, railroad yards, and parking lots, the <Feature Edge> instances represent their boundaries as well as roads, railroads, and runways, and the <Feature Node> instances represent road intersections and railroad crossings.

FAQs

Why is <Feature Topology> defined separately from <Geometry Topology>?

<Feature Topology> includes both the geometric and the topological aspects of <Feature Representation> instances, while <Geometry Topology> includes only the topological aspects of <Geometry Representation>, which are completely optional.

Constraints

• <<Publishable Object>>
• <<Property Constraints>>

Composed of (two-way)

• zero or more <Property Value> instances

Component of (two-way)

• one or more <Union Of Feature Topology> instances

Inherited Field Elements