The SEDRIS Data Representation Model
APPENDIX A - Classes
Universal Feature Face

Class Name: Universal Feature Face

Superclass - <Feature Face>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class is a <Feature Face> that represents the infinite area "outside" an explicitly defined topological surface. A <Universal Feature Face> has no explicitly defined outer boundary, but will have at least one explicit inner 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. A topological surface represents the terrain surface over a one degree square area. The <Universal Feature Face> instance within this topological surface represents the infinite area outside of this one degree square.

FAQs

When is a <Universal Feature Face> instance required?

At feature topology level 3, a single <Universal Feature Face> instance is required within each separate topological surface, in order to fulfill the requirement for an exclusive and exhaustive partitioning of the topological surface. <Universal Feature Face> instances are not used at any other feature topology level, and are not normally associated with an <Areal Feature>.

Constraints

Associated by (one-way)(inherited)

Associated with (two-way)(inherited)

Composed of (two-way)(inherited)

Component of (two-way)(inherited)

Inherited Field Elements

This class has no inherited field elements.

Notes

Associated with Notes


Feature_Edge

 These <Feature Edge> instances are those that border the
 given <Feature Face> instance. The converse of this
 relationship is that between <Feature Face Ring> and
 <Feature Edge>.

Feature_Node

 If specified, these <Feature Node> instances are contained
 within the <Feature Face>; see this class' constraints for
 further details.
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Last updated: May 15, 2003 Copyright © 2003 SEDRIS™