====== TWIN-001b — Preserve Twin Identity Across Realizations ======

[[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 associate every [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_realization|Twin Realization]] of the same [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]] with the same [[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]], virtual and physical Twin Node concepts and 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//

===== Rationale =====

A [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]] represents the logical twin independently of any particular [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_realization|Twin Realization]].

The source material permits multiple realizations of the same twin, including virtual and physical or real-world realizations. Preserving the same [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identifier|Twin Identifier]] across those realizations allows a [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]] to select or substitute a realization without changing the logical participant represented by the test.

This separation also supports comparing results from different Twin Realizations of the same Twin Identity.

===== 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_realization|Twin Realization]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_node|Twin Node]]
  * [[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]]

===== Verification =====

Verification confirms that:

  - Two or more Twin Realizations associated with the same Twin Identity reference the same Twin Identifier.
  - Selection of a different Twin Realization for a Test Execution preserves the Twin Identifier.
  - Replacement or removal of a Twin Realization does not alter the Twin Identifier assigned to the Twin Identity.
  - A Twin Realization associated with a different Twin Identity does not reference the Twin Identifier assigned to the first Twin Identity.

Verification includes inspection of a Twin Identity associated with at least two Twin Realizations and execution of a realization-selection or substitution test.

===== Traceability =====

{{backlinks>.}}

===== ConOps Relationship =====

This requirement supports ConOps activities that select or substitute among alternative Twin Realizations while preserving the identity of the logical twin represented within the Test Execution.

===== Delivery Phase =====

TBD

===== Requirement Status =====

Draft

===== Statement Reference =====

<code dokuwiki>
{{section>dido:03-dido-te:99-annexes:annex-c-requirements:03-functional-requirements:03-03-twin-node-requirements:twin-001-establish-twin-identity:twin-001b-preserve-twin-identity-across-realizations#Statement&noheader&nofooter&noeditbtn}}
</code>

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