Class

• <DRM Feature Face Ring>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

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

Class diagram

Figure 6.90 — DRM_Feature_Face_Ring

Constraints

• Face ring edge consistency
• Publishable Object

Example(s)

• Consider an <DRM Areal Feature> L representing an ECC_LAKE. The topology of L is represented by a regular <DRM Feature Face>, the outer boundary of which is defined by 2 <DRM Feature Edge> instances, one defining the north shore of the ECC_LAKE, the other defining the south shore.

  To indicate that these 2 <DRM Feature Edge> instances define the outer boundary of the ECC_LAKE, they are components of an external <DRM Feature Face Ring>, which is in turn a component of the <DRM Feature Face> specifying the topology of L. The <DRM Edge Direction> associated with each <DRM Feature Edge> indicates its orientation with respect to the <DRM Feature Face Ring>.

  

  Figure 6.91 — <DRM Feature Face Ring> example