====== Twin Identifier ======

[[dido:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]

===== Discussion =====

A Twin Identifier identifies a [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]] independently of the individual [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_realization|Twin Realizations]] associated with it.

The Twin Identifier provides a stable reference for Configuration, [[dido:99_annexes:annex-b-terms-and-definitions:t:test_definition|Test Definitions]], [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Executions]], comparison, Validation, Evidence, and [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]] involving the logical twin.

A Twin Identifier remains distinct from implementation-specific identifiers such as container identifiers, process identifiers, host names, network addresses, DDS entity identifiers, or identifiers assigned to individual Twin Realizations.

===== Definition =====

//an identifier assigned to a [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]]//

===== Source =====

  * [[dido:03-dido-te:99-annexes:annex-b-references:dte-001|[DTE1] U.S. Patent Application US20220237111A1]], Twin Node concepts and identifiers shared among Twin Nodes
  * DIDO-TE normalization of the source concept

===== Note =====

Multiple Twin Realizations associated with the same Twin Identity reference the same Twin Identifier.

A Twin Identifier identifies the logical twin rather than a particular realization of that twin.

The representation, encoding, and implementation mechanism used for a Twin Identifier belong to the applicable logical or physical model rather than to the conceptual definition.

===== Example =====

The Twin Identifier ''T-4711'' identifies a logical twin. A virtual Twin Realization and a real-world Twin Realization both reference ''T-4711'' while retaining separate realization identifiers.

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