Class Name: Feature Model Instance

Superclass - Feature Hierarchy

Definition

A single case of the existence of a Feature Model within a given transmittal, including variations or specialization unique to that case.

Primary Page in DRM Diagram:

• 7

Secondary Pages in DRM Diagram:

• 2
• 8
• 16

Example

1. Consider a Model of a forested area, consisting of a Geometry Model describing its renderable geometry, and a Feature Model describing it in terms of a collection of Areal Features. The Geometry Model's Geometry Hierarchy and the Feature Model's component Union of Features are connected by an association relationship, to indicate that they are alternate representations of the same entity.

   Wherever the Model is to be instanced, a Feature Model Instance object will be placed, with the appropriate Transformation to locate it in space and any Expressions required for Variables within the Feature Model.

FAQs

See also Feature Model for a discussion of topology.

.

Constraints

• Image Mapping Functions and Texture Coordinates
• No Attribute Conflicts
• Non Crossing Aggregations
• Non Crossing Associations
• Precedence of Attribute Set Index
• Non Cyclic Aggregations
• Distinct Link Objects
• Model Spatial Reference Frame

Associated to (one-way)

• one Feature Model

Associated by (one-way)(inherited)

• optionally, a Hierarchy Summary Item

Associated with (two-way)(inherited)

• optionally, some Features
• optionally, some Geometry Hierarchies
• optionally, some Property Grids

Composed of (one-way)(inherited)

• optionally, some {ordered} Attribute Set Indices
• optionally, a Classification Data
• optionally, some Colors
• optionally, some {ordered} Image Mapping Functions (notes)
• optionally, some Labels
• optionally, some Property Tables
• optionally, some Property Table References
• optionally, some Property Values
• optionally, a Rendering Priority Level
• optionally, a Spatial Domain
• optionally, a Reference Surface
• optionally, some Sound Instances

Composed of (one-way)

• optionally, a Transformation

Composed of (two-way)

• optionally, some Expressions through Feature Instance Template Indices

Composed of (one-way metadata)(inherited)

• optionally, an Access
• optionally, some Browse Graphics
• optionally, some Cross References
• optionally, a Data Quality
• optionally, a Keywords
• optionally, a Point of Contact
• optionally, a Time Constraints Data

Component of (two-way)(inherited)

• optionally, some Union of Features
• optionally, some Alternate Hierarchy Related Features through Feature Hierarchy Data
• optionally, some Classification Related Features through Feature Classification Data
• optionally, an Environment Root
• optionally, a Feature Model
• optionally, some Time Related Features through Feature Time Constraints Data
• optionally, some Level of Detail Related Features through Feature Level of Detail Data
• optionally, some Oct Tree Related Features through Feature Oct Tree Data
• optionally, some Perimeter Related Features through Feature Perimeter Data
• optionally, some Quad Tree Related Features through Feature Quad Tree Data
• optionally, some Spatial Index Related Features through Feature Spatial Index Data
• optionally, some State Related Features through Feature State Data

Inherited Field Elements

Notes

Composed of Notes

Image_Mapping_Function

 Added to support "attributes for derived objects."
 That is, these components are used only to specify
 texture mapping information for geometry that
 is derived from the <Feature> by the consumer.
 These <Image Mapping Functions> must use
 <Image Anchor> components to specify the mapping.