Class Name: Geometry Face

Superclass - <Geometry Topology>

Subclasses

Definition

An instance of this DRM class specifies a significant polygonal area.

The external boundary of a <Geometry Face> instance is specified by its <Geometry Face Ring> component.

Primary Page in DRM Diagram:

• 13

Secondary Pages in DRM Diagram:

• 5

Example

1. A triangulation of <Polygon> instances that detail the upper surface of a forest canopy is composed of many <Geometry Face> instances.

FAQs

No FAQs supplied.

Constraints

• <<Contained Node Restrictions>>

Associated by (one-way)

• one or more <Geometry Edge> instances (notes)

Associated with (two-way)

• zero or more <Geometry Node> instances (notes)
• zero or more <Polygon> instances

Composed of (two-way)(inherited)

• zero or one <Geometry ID> instance

Composed of (two-way)

• one <Geometry Face Ring> instance
• zero or more <Same As Geometry Face> instances

Component of (two-way)(inherited)

• one <Union Of Geometry Topology> instance

Inherited Field Elements

Notes

Associated with Notes

Geometry_Edge

 The <Geometry Edge> instances that border a <Geometry Face>
 instance - in other words, those specifying its <Geometry Face Ring>
 component - associate to that <Geometry Face> instance in
 order that it may be possible to determine, for any
 <Geometry Edge> instance, the topological relationships in
 which it participates.

Geometry_Node

 For level 3 topology or higher, any <Geometry Node> instances
 contained within the boundary of a <Geometry Face> instance
 have an association relationship with that <Geometry Face>
 instance to indicate the relationship.

 For topology of less than level 3, the association relationship
 between instances of <Geometry Face> and <Geometry Node> has
 the same meaning, but data providers are not required to
 supply the information.