Abstract Class Name: Feature Face Ring

Superclass - <SEDRIS Abstract Base>

Subclasses

• <External Feature Face Ring>
• <Internal Feature Face Ring>

Definition

An instance of this DRM class represents the one-directional topological relationship from a <Feature Face> to the ordered collection of one or more <Feature Edge> instances that define one of its boundaries (outer or inner).

Primary Page in DRM Diagram:

• 12

Secondary Pages in DRM Diagram:

Example

See <External Feature Face Ring>, <Internal Feature Face Ring> for examples.

FAQs

When are <Feature Face Ring> instances required?

All <Feature Face> instances are required to have at least one <Feature Face Ring> component, regardless of feature topology level. A <Regular Feature Face> shall have an <External Feature Face Ring>, which defines its outer boundary, and may have any number of <Internal Feature Face Ring> components, which define inner boundaries (i.e., "holes") within the <Feature Face>. A <Universal Feature Face> has no <External Feature Face Ring>, but will have one or more <Internal Feature Face Ring> components.

Can the same <Feature Edge> appear more than once in the collection of <Feature Edge> instances making up a <Feature Face Ring>?

Yes. A <Feature Edge> can appear up to twice in a <Feature Face Ring>, once with each orientation.

Constraints

• <<Face Ring Edge Consistency>>

Associated to (one-way)

• one or more {ordered} <Feature Edge> instances through <Edge Directions>

Inherited Field Elements