Class Name: Attribute Set Table Group

Superclass - SEDRIS Abstract Base

Definition

An interchangeable group of one or more Attribute Set Tables. The primary Attribute Set Table in the group is indicated by the primary_table_index. When a reference is made to an Attribute Set Table from somewhere in the transmittal (for example, from an Attribute Set Index component of a Polygon), the reference identifies the Attribute Set Table Group and the index_number (the Attribute Set within the Attribute Set Table). Which Attribute Set Table within the Attribute Set Table Group is not specified. By definition, an Attribute Set Index refers to an Attribute Set entry from the primary Attribute Set Table of the indicated Attribute Set Table Group. An alternate Attribute Set Table from within the Attribute Set Table Group can be chosen at the discretion of the end system or run-time system in order to meet the needs of the end system or run-time system.

All of the Attribute Set Tables within an Attribute Set Table Group must be of the same size; that is, all Attribute Set Tables within an Attribute Set Table Group must contain the same number of Attribute Sets. This is a requirement in order to allow the Attribute Set Tables within an Attribute Set Table Group to be interchangeable. However, Attribute Set Tables within an Attribute Set Table Group are free to have different attribute objects from each other.

Primary Page in DRM Diagram:

• 19

Secondary Pages in DRM Diagram:

• 10

Example

1. One Attribute Set Table Group in the transmittal, and that group has only one Attribute Set Table within the group. That Attribute Set Table is the one and only Attribute Set Table for the entire transmittal.
2. An Attribute Set Table Group with two Attribute Set Tables. One Attribute Set Table for normal, Out The Window (OTW) viewing, and another Attribute Set Table to change the appearance of the view to be a view as seen through Night Vision Goggles (NVG).
3. An Attribute Set Table Group with 3 Attribute Set Tables with the same usage of OTW. Why 3 tables? One Attribute Set Table defines the colors and textures as originally created by the data modelers. The second Attribute Set Table has different shades of blue for the lakes and skies because a company VIP came through and didn't like the blues that were there. The third Attribute Set Table contains yet another set of blues for the lakes, different textures for the lakes and different shades of green for the trees and tanks, because the customer in charge of the program came through and didn't think the colors and textures were realistic.

FAQs

Can a transmittal in any way refer to an Attribute Set Table in an Attribute Set Table Group other than the primary Attribute Set Table?

No. The only Attribute Set Table that can be referenced in any Attribute Set Table Group is the primary Attribute Set Table.

Since you can't refer to them, why bother to have alternate Attribute Set Tables within an Attribute Set Table Group?

Because in real life, many run-time systems do have multiple color and material tables they can switch between for various reasons, and these tables should be shared to promote interoperability. See the example section, below.

Constraints

• Attribute Set Table Size
• Valid ID Field

Associated by (one-way)

• optionally, some Attribute Set Indices

Composed of (two-way)

• one or more {ordered} Attribute Set Tables

Composed of (one-way metadata)

• optionally, an Access
• optionally, a Citation
• optionally, some Cross References
• optionally, a Description
• optionally, a Keywords
• optionally, a Point of Contact

Component of (two-way)

• one Attribute Set Table Library

Field Elements

Notes

Fields Notes

primary_table_index

 index of the primary <Attribute Set Table> component
 (from the ordered list of <Attribute Set Table>
 components in this <Attribute Set Table Group>)

table_size

 the size of any and all <Attribute Set Tables>
 within this <Attribute Set Table Group>