====== TWIN-001a — Assign a Twin Identifier ======

[[dido:03-dido-te:99-annexes:annex-c-requirements:03-functional-requirements:03-03-twin-node-requirements:twin-001-establish-twin-identity:start|Go to TWIN-001 — Establish Twin Identity]]

===== Statement =====

The [[dido:99_annexes:annex-b-terms-and-definitions:d:dido-te|DIDO-TE]] SHALL assign each logical [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]] a unique [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identifier|Twin Identifier]].

===== Source =====

  * [[dido:03-dido-te:99-annexes:annex-b-references:dte-001|[DTE1] U.S. Patent Application US20220237111A1]], Twin Node claims describing identifiers shared among Twin Nodes
  * [[dido:03-dido-te:99-annexes:annex-b-references:dte-002|[DTE2] Non-Traditional BAA Submission]], F17, //Twin Nodes Selection//
  * [[dido:03-dido-te:99-annexes:annex-b-references:dte-009|[DTE9] Distributed Immutable Data Object Reference Architecture (DIDO-RA)]], Appendix A, //Digital Twin//

===== Rationale =====

A stable logical identity distinguishes the twin from the individual [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_realization|Twin Realizations]] that represent it.

The [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identifier|Twin Identifier]] provides the common identity needed to associate multiple Twin Realizations with the same [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]] and to preserve that identity when a [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]] selects a different realization.

The Twin Identifier remains independent of container identifiers, process identifiers, host names, network addresses, DDS entity identifiers, and other realization-specific identifiers.

===== Applies To =====

  * [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identifier|Twin Identifier]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_node|Twin Node]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_realization|Twin Realization]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_definition|Test Definition]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]]