The SEDRIS Data Representation Model
APPENDIX A - Classes
Geometry Edge

Class Name: Geometry Edge

Superclass - <Geometry Topology>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class is a one-dimensional <Geometry Topology> instance consisting of an ordered collection of <Location> instances connecting one <Geometry Node> instance to another <Geometry Node> instance. The orientation of a <Geometry Edge> instance is defined by the order of its <Location> components, taken in conjunction with its starting <Geometry Node> instance and ending <Geometry Node> instance.

A <Geometry Edge> instance is used to represent the location of a segment of one or more <Linear Geometry> instances and/or a boundary of one or more <Geometry Face> instances.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

  1. A <Line> instance that represents the lighting of a runway consists of two <Geometry Edge> instances, representing the lights on each side of the runway.

FAQs

No FAQs supplied.

Constraints

Associated with (two-way)

Component of (two-way) (inherited)

Inherited Field Elements

This class has no inherited field elements.

Notes

Associated with Notes


Geometry_Face

If present, these <Geometry Face> instances (if any exist) are those bordered by the <Geometry Edge> instance, ordered counterclockwise when looking along the <Geometry Edge> instance. The converse of this relationship is that between <Geometry Face> instances and <Geometry Edge> instances.


Geometry_Node

This association specifies that the <Geometry Edge> instance is bounded by these <Geometry Node> instances. The first <Geometry Node> instance is the starting node of the <Geometry Edge> instance, while the second <Geometry Node> instance is the ending node.


Geometry_Volume

These <Geometry Volume> instances are those that contain the <Geometry Edge> instance.


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Last updated: July 26, 2006 Copyright © 2006 SEDRIS