The SEDRIS Data Representation Model
APPENDIX A - Classes
Geometry Topology Hierarchy
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Abstract Class Name: Geometry Topology Hierarchy
Subclasses
Definition
A spatially organized hierarchical collection of
<Geometry Topology> instances, which
includes all of the <Geometry Topology>
instances that lie within a defined spatial extent, and are components
of a single <Aggregate Geometry>.
Primary Page in DRM Diagram:
Secondary Pages in DRM Diagram:
This class appears on only one page of the DRM class diagram.
Example
- The set of all <Geometry 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 <Geometry Topology>
instances to be spatially organized using different methods. It ensures
that all <Geometry Topology> instances,
particularly those that are not directly associated with any
<Geometry>, have at least one containing object.
- Why not restrict
<Geometry 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?
- We require the ability 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
None.
Component of (two-way)
Inherited Field Elements
This class has no inherited field elements.
Prev: Geometry Topology.
Next: GM Location 3D.
Up:Index.
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Last updated: October 1, 2002
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Copyright © 2002 SEDRIS™
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