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The SEDRIS Data Representation Model
 APPENDIX A - Classes Union Of Geometry Topology  | 
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An instance of this DRM class is a collection of all of the <Geometry Topology> instances that form a complete topological surface.
No Example supplied.
This class allows <Geometry Topology> instances to be grouped in an arbitrary manner. It is used to ensure that all <Geometry Topology> instances, particularly those that are not directly associated with any <Geometry>, have at least one containing object.
| SE_Geometry_Topology_Level | geometry_topology_level; | 
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