The SEDRIS Data Representation Model
APPENDIX B - Constraints
Unique ID Field

Definition

For any class that has an ID field, the ID is unique for all objects of that class within a given transmittal.

Specifically, within the component tree of a given <Transmittal Root>:

  1. No two <Camera Point> instances may have identical values for their ID fields.

  2. No two <Feature ID> instances may have identical values for their ID fields.

  3. No two <Geometry ID> instances may have identical values for their ID fields.

Rationale

IDs exist to uniquely identify objects in a given context; consequently, they shall be unique to each object of a given class.

Example

No Example supplied.

FAQs

No FAQs supplied.

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