Table 6.28— DRM_Attribute_Set_Table_Library

Property

Description

Superclass

· <DRM Library>

Class

· <DRM Attribute Set Table Library>

Subclass

· none

Definition

A <DRM Library> of <DRM Attribute Set Table Group>s.

Example(s)

· Consider a transmittal containing large stretches of various types of terrain, represented with texture-mapped <DRM Polygon>s, where the textures are blended with <DRM Colour>s.

For efficiency, the source of this transmittal uses a library of terrain textures, which are repeated at intervals across the terrain. Consequently, a limited number of <DRM Image Mapping Function>, <DRM Colour> pairs are repeated across a large number of <DRM Polygon>s as components.

Rather than creating many duplicate objects, the data provider creates an <DRM Attribute Set Table Library>. Each of the <DRM Image Mapping Function>, <DRM Colour> pairs is placed in a <DRM Attribute Set>, which is in turn stored in the primary <DRM Attribute Set Table> of an <DRM Attribute Set Table Group> within the library.

Each <DRM Polygon> is then given an <DRM Attribute Set Index> component, which is associated to the appropriate <DRM Attribute Set Table Group>.

Inherited field elements

field_name	range	Field_Data_Type
none

Field elements

field_name	range	Field_Data_Type
none

Associated to (one-way) (inherited)

· none

Associated to (one-way)

· none

Associated by (one-way) (inherited)

· none

Associated by (one-way)

· none

Associated with (two-way) (inherited)

· none

Associated with (two-way)

· none

Composed of (two-way) (inherited)

· none

Composed of (two-way)

· one or more {ordered} <DRM Attribute Set Table Group>s

Composed of (two-way metadata) (inherited)

· zero or one <DRM Access>

· zero or more <DRM Browse Media>s

· zero or one <DRM Citation>

· zero or more <DRM Cross Reference>s

· zero or one <DRM Data Quality>

· zero or one <DRM Description>

· zero or one <DRM Keywords>

· zero or one <DRM Point Of Contact>

Composed of (two-way metadata)

· none

Component of (inherited)

· none

Component of

· one <DRM Transmittal Root>

Constraints

· none

Notes

none

Class diagram

<DRM Attribute Set Table Library>