The SEDRIS Data Representation Model
APPENDIX A - Classes
External Feature Face Ring

Class Name: External Feature Face Ring

Superclass - <Feature Face Ring>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class specifies the one-way topological relationship of a <Regular Feature Face> to the ordered collection of <Feature Edge> instances that define its outer boundary.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

This class appears on only one page of the DRM class diagram.

Example

  1. The outer boundary of a < Regular Feature Face> representing a lake is defined by 2 <Feature Edges>, one defining the north shore of the lake and the other defining the south shore. These 2 <Feature Edges> are the components of an < External Feature Face Ring>, which is in turn a component of the < Regular Feature Face>. The < Edge Direction> associated with each < Feature Edge> indicates its orientation with respect to the ring.

    External Feature Face Ring, Example 1

FAQs

Can the same <Feature Edge> appear more than once in the collection of <Feature Edges> to which an < External Feature Face Ring> is associated?
Yes. If the <Feature Edge> is contained within the outer boundary of the < Regular Feature Face>, and is attached to the outer boundary of the <Regular Feature Face>, such that it has the <Regular Feature Face> on both sides, it will appear exactly twice in the <External Feature Face Ring>, once with each orientation.

Constraints

Associated to (one-way)(inherited)

Component of (two-way)

Inherited Field Elements

This class has no inherited field elements.
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Last updated: October 1, 2002 Copyright © 2002 SEDRIS™