Feature Model Instance

The SEDRIS Data Representation Model APPENDIX A - Classes Feature Model Instance

Class Name: Feature Model Instance

Superclass - <Feature Hierarchy>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class specifies a single use of a <Feature Model> instance within a given transmittal, including variations or specialization unique to that case. In particular, a <Feature Model Instance> instance is used to transform a <Feature Model> instance into the SRF of another <Feature Model> instance or that of an <Environment Root> instance.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

Consider a <Model> instance representing a forested area, consisting of a <Geometry Model> component describing its renderable geometry and a <Feature Model> component describing it in terms of a collection of <Areal Feature> instances. The <Geometry Hierarchy> component of the <Geometry Model> component and the <Union Of Features> component of the <Feature Model> component are connected by association relationships to indicate that they are alternate representations of the same entity.
Wherever the <Model> instance is to be instantiated, a <Feature Model Instance> instance is placed, with the appropriate <Transformation> component to locate it in space and any <Expression> instances required for <Variable> instances within the <Feature Model> instance.

FAQs

Where can users find further information on feature topology in the DRM?: See P4V4 of the SEDRIS Documentation Set for further information.

Constraints

Associated to (one-way) (inherited)

zero or more <Feature Representation> instances, each through the use of a <Base Association Data> link object¹
zero or more <Geometry Hierarchy> instances, each through the use of a <Base Association Data> link object²
zero or more <Property Grid> instances, each through the use of a <Base Association Data> link object³

Associated to (one-way)

one <Feature Model> instance

Associated by (one-way) (inherited)

zero or more <Feature Representation> instances, each through the use of a <Base Association Data> link object⁴
zero or more <Geometry Hierarchy> instances, each through the use of a <Base Association Data> link object⁵
zero or more <Property Grid> instances, each through the use of a <Base Association Data> link object⁶
zero or one <Hierarchy Summary Item> instance

Composed of (two-way) (inherited)

zero or one <Classification Data> instance
zero or more <Label> instances
zero or more {ordered} <Property Set Index> instances
zero or more <Property Table> instances
zero or more <Property Table Reference> instances
zero or more <Property Value> instances
zero or one <Rendering Priority Level> instance
zero or one <Reference Surface> instance
zero or more <Sound Instance> instances

Composed of (two-way)

zero or more <Expression> instances, each through the use of a <Model Instance Template Indices> link object
zero or one <Transformation> instance⁷

Composed of (two-way metadata) (inherited)

zero or one <Data Quality> instance
zero or one <Identification> instance
zero or one <Time Constraints Data> instance

Component of (two-way) (inherited)

zero or more <Union Of Features> instances
zero or more <Alternate Hierarchy Related Features> instances, each through the use of a <Hierarchy Data> link object
zero or more <Classification Related Features> instances, each through the use of a <Classification Data> link object
zero or one <Environment Root> instance
zero or one <Feature Model> instance
zero or more <LOD Related Features> instances, each through the use of a <Base LOD Data> link object
zero or more <Octant Related Features> instances, each through the use of a <Octant Data> link object
zero or more <Perimeter Related Features> instances, each through the use of a <Perimeter Data> link object
zero or more <Quadrant Related Features> instances, each through the use of a <Quadrant Data> link object
zero or more <Spatial Index Related Features> instances, each through the use of a <Spatial Index Data> link object
zero or more <State Related Features> instances, each through the use of a <State Data> link object
zero or more <Time Related Features> instances, each through the use of a <Time Constraints Data> link object

Inherited Field Elements

This class has no inherited field elements.

Notes

Associated to Notes

Feature_Representation

An association between two <Feature Representation> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <Base Association Data> link object on the association relationship.

Geometry_Hierarchy

An association between a <Geometry Hierarchy> instance and a <Feature Representation> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <Base Association Data> link object on the association relationship.

Property_Grid

An association between a <Property Grid> instance and a <Feature Representation> instance indicates that the environmental object(s) represented by the <Feature Representation> instance and the <Property Grid> instance (or some specific cell data within that <Property Grid> instance) have the semantic relationship indicated by the <Base Association Data> link object on the association relationship. Each associated <Property Grid> instance indicates whether the entire <Property Grid> instance or only some specific cell data within it is participating in the relationship in question.

Associated from Notes

Feature_Representation

Geometry_Hierarchy

Property_Grid

Composed of Notes

Transformation

The <Transformation> component positions and orients the <Feature Model Instance> instance in the target SRF.

Prev: Feature Model. Next: Feature Node. Up:Index.

Last updated: July 26, 2006