Class Name: Internal Feature Face Ring
Definition
The one-directional topological relationship between a
Feature Face and the ordered collection of one
or more Feature Edges that define one of
its inner boundaries (i.e., a "hole" within the
Feature Face).
Primary Page in DRM Diagram:
Example
- An island within a lake is represented by a
Regular Feature Face. The shoreline of
the island is represented by a single Feature
Edge, and the lake is represented by another
Regular Feature Face. The
Feature Edge that defines the shoreline of the
island is the sole component of an
Internal Feature Face Ring
component of the Regular Feature Face
that represents the lake. The
Feature Ring Edge Direction
associated with each Feature Edge indicates its
orientation with respect to the ring.
<Regular Feature Face> (lake)
<>
|
|
<Internal Feature Face Ring>
<>
|
|--<Feature Ring Edge Direction>
|
<Feature Edge> (island shoreline)
FAQs
- When is an Internal Feature
Face Ring object required?
- An Internal Feature Face Ring
object is required whenever a Feature Face
contains a "hole" within its outer boundary, regardless of the
feature topology level. All Universal
Feature Face objects are required to have at least one
Internal Feature Face Ring
component.
- Can the same Feature Edge appear more
than once in the collection of Feature Edges
that are the components of an
Internal Feature Face
Ring?
- Yes. If the Feature Edge is contained
within the boundaries of a Regular Feature
Face, and is attached to an inner boundary of the
Regular Feature Face, such that it has
the Regular Feature Face on both sides,
it will appear exactly twice in the
Internal Feature Face Ring, once
with each orientation.
- What is the relationship between the
Internal Feature Face Ring class
and the Bordered Feature Face class?
- The Internal Feature Face Ring
class and the Bordered Feature Face
class form the two halves of the bidirectional topological relationship
between Feature Faces and
Feature Edges. Whenever a
Feature Edge appears in the collection of
Feature Edge components of an
Internal Feature Face Ring
component of a Feature Face, that same
Feature Face must appear in the collection of
Feature Faces associated with the
Bordered Feature Face component of
that Feature Edge.
Constraints
Composed of (one-way)(inherited)
Component of (one-way)
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