The SEDRIS Data Representation Model
APPENDIX A - Classes
Perimeter Related Features

Class Name: Perimeter Related Features

Superclass - <Aggregate Feature>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class is an <Aggregate Feature> that spatially organizes its component <Feature Hierarchy> objects into a collection of (potentially) irregularly shaped regions, each defined by a <Perimeter Data> instance. That is, each component <Feature Hierarchy> is contained within the perimeter area specified by the <Perimeter Data> associated with that component.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

This class appears on only one page of the DRM class diagram.

Example

No Example supplied.

FAQs

May the regions defined by the components of a <Perimeter Related Features> instance overlap?

See <<Perimeter Related Organizing Principle>>

May the same <Feature> be contained within more than one of the components of a <Perimeter Related Features> instance?

See <<Perimeter Related Organizing Principle>>

Does each of the components of a <Perimeter Related Features> instance form an independent topological surface?

Normally, yes. In this case, each component <Feature Hierarchy> would have its own <Feature Topology Hierarchy>. However, the <Feature Topology> instances in all the components may also form a single topological surface, in which case only the <Perimeter Related Features> instance itself would have such a topology hierarchy.

Constraints

Associated by (one-way)(inherited)

Associated with (two-way)(inherited)

Composed of (two-way)(inherited)

Composed of (two-way)

Composed of (two-way metadata)(inherited)

Component of (two-way)(inherited)

Inherited Field Elements

SE_Boolean unique_descendants; (notes)
SE_Boolean strict_organizing_principle; (notes)

Notes

Associated with Notes


Feature

 An association between two <Feature> instances indicates
 that they are alternate representations of the same
 environmental object.

Geometry_Hierarchy

 An association between a <Geometry Hierarchy> instance and a
 <Feature> instance indicates that the <Geometry Hierarchy>
 and the <Feature> are alternate representations of the same
 environmental object.

Property_Grid

 An association between a <Property Grid> instance and a
 <Feature> instance indicates that the <Feature> and the <Property Grid>
 (or some specific cell data within that <Property Grid>) are
 alternate representations of the same environmental object.
 Each associated <Property Grid> will indicate which is the case.

Composed of Notes


Image_Mapping_Function

 This relationship exists to support "attributes for derived objects."
 That is, these components are used only to specify texture mapping
 information for geometry that is to be derived from the
 <Aggregate Feature> by the consumer. These <Image Mapping Function>
 instances shall use <Image Anchor> components to specify the mapping.

Presentation_Domain

 This is needed for cases in which an <Aggregate Feature> is
 significant only for a particular domain, such as radar.

Fields Notes


unique_descendants

 If this value is SE_TRUE, each 'descendant' of this aggregation -
 that is, each <Feature> instance that exists in the component tree
 rooted at the given <Aggregate Feature> - shall be unique, in the
 sense that it shall appear in only one 'branch' of this aggregation.
 If unique_descendants is SE_FALSE, at least one <Feature> instance
 appears in more than one 'branch' of the aggregation.

strict_organizing_principle

 If this value is SE_TRUE, each 'branch' of this aggregation
 strictly complies with the organizing principle for its
 particular subclass. If this value is SE_FALSE, at least
 one 'branch' does not strictly comply with the given
 organizing principle. See the organizing principle constraint
 for each specific subclass for details.
Prev: Perimeter Related Feature Topology. Next: Perimeter Related Geometry. Up:Index.

Last updated: May 15, 2003 Copyright © 2003 SEDRIS™