Class Name: Universal Feature Face

Superclass - Feature Face

Definition

A Feature Face object 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:

• 12

Example

1. A topological surface represents the terrain surface over a one degree square area. The Universal Feature Face object within this topological surface represents the infinite area outside of this one degree square.

FAQs

When is a Universal Feature Face object required?

At feature topology level 3, a single Universal Feature Face object 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 Faces are not used at any other feature topology level, and are not normally associated with an Areal Feature.

Constraints

• No Attribute Conflicts
• Perimeter Related Feature Topology Partitioning
• Contained Node Restrictions
• Edges Bordering Faces
• Feature Edge Restrictions
• Non Crossing Associations
• Universal Feature Face Level 3

Associated by (one-way)(inherited)

• optionally, some Bordered Feature Faces
• optionally, some Contained Within Feature Faces

Associated with (two-way)(inherited)

• optionally, a Feature Face

Composed of (one-way)(inherited)

• optionally, a Feature ID
• optionally, some Property Values
• optionally, some Contained Feature Nodes
• optionally, some Internal Feature Face Rings
• optionally, some Same As Feature Faces

Component of (two-way)(inherited)

• optionally, some Union of Feature Topologies
• optionally, some Areal Features through Face Directions