Abstract Class Name: Feature Topology Hierarchy

Superclass - <SEDRIS Abstract Base>

Subclasses

• <Perimeter Related Feature Topology>
• <Spatial Index Related Feature Topology>
• <Union Of Feature Topology>

Definition

A spatially organized hierarchical collection of <Feature Topology> instances, which includes all of the <Feature Topology> instances that lie within a defined spatial extent, and are components of a single <Aggregate Feature>.

Primary Page in DRM Diagram:

• 11

Secondary Pages in DRM Diagram:

• 8

Example

1. The set of all <Feature Topology> instances contained within an independent topological surface, organized into a collection of regularly or irregularly shaped tiles.

FAQs

What is the purpose of this class?

This class allows <Feature Topology> instances to be spatially organized using different methods. It ensures that all <Feature Topology> instances, particularly those that are not directly associated with any <Feature>, have at least one containing object.

Why not restrict <Feature Topology Hierarchy> to be a component of just <Environment_Root> and <Model> - placing Topology as an organizing principle on par with <Geometry> organizations and <Feature> organizations?

It shall be possible to spatially organize the topology of every 'topological surface'. A 'topological surface' is not necessarily 'rooted at' a <Environment_Root> or a <Model> instance. In general, we allow for many different 'topological surfaces' to exist within a <Environment_Root> or a <Model>.

Constraints

Component of (two-way)

• one or more <Aggregate Feature> instances

Inherited Field Elements

Field Elements