Contained Feature Node

Class Name: Contained Feature Node

The one-directional topological relationship between a Feature Face and a Feature Node that is contained within its boundaries.

A Feature Face representing part of an ocean contains two Feature Nodes, which represent two oil platforms. The Feature Face must have 2 Contained Feature Node components, which in turn must have the 2 Feature Nodes as components. Note that each of the 2 Feature Nodes would have Contained Within Feature Face components, which would be associated with the Feature Face.

When is a Contained Feature Node object required?: At feature topology levels 3 and 4, a Feature Face object is required to have a Contained Feature Node component for each Feature Node that is located within its boundaries. At feature topology levels 0 through 2, the Contained Feature Node component is optional. Also, if a Feature Face does not contain any Feature Nodes within its boundaries, it must not have any Contained Feature Node components.
Can the same Feature Node be a component of more than one Contained Feature Node object?: No. Since a Feature Node can only be located within the boundaries of one Feature Face, it may only be a component of a single Contained Feature Node object.
What is the relationship between the Contained Feature Node class and the Contained Within Feature Face class?: The Contained Feature Node class and the Contained Within Feature Face class form the two halves of the bidirectional topological relationship between Feature Faces and Feature Nodes. Whenever a Feature Node appears as a component of a Contained Feature Node component of a Feature Face, that same Feature Face must be associated with a Contained Within Feature Face component of that Feature Node and vice versa, if the topology level is 3 or higher.