====== Twin Relationship ======

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

===== Discussion =====

A Twin Relationship establishes the semantic relationship between a [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]] and the [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_realization|Twin Realizations]] associated with that identity.

The Twin Relationship identifies the characteristics, information, and conditions relevant to representing the logical twin across its Twin Realizations.

The applicable [[dido:99_annexes:annex-b-terms-and-definitions:c:configuration|Configuration]] specifies the characteristics represented by the relationship and the parameters governing data mapping, source eligibility, source selection, communication, synchronization, and fidelity.

A Twin Relationship remains distinct from the communication mechanisms used to exchange information among Twin Realizations. Technologies such as [[dido:99_annexes:annex-b-terms-and-definitions:d:dds|DDS]] may realize information exchange within the relationship without defining its semantic meaning.

===== Definition =====

//a semantic relationship between a [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_identity|Twin Identity]] and its associated [[dido:99_annexes:annex-b-terms-and-definitions:t:twin_realization|Twin Realizations]] that identifies the characteristics and conditions represented across those realizations//

===== 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]], Digital Twin concepts and 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//
  * DIDO-TE normalization of the source concepts

===== Note =====

A Twin Relationship does not require every available characteristic of a Twin Realization to participate in the relationship.

The applicable Configuration identifies the characteristics that participate in a particular Twin Relationship.

A communication match, DDS discovery event, Topic match, or Quality of Service match does not, by itself, establish a Twin Relationship.

===== Example =====

A Twin Identity has a virtual Twin Realization and a real-world Twin Realization. Their Twin Relationship identifies operational state, selected inputs and outputs, and timing behavior as represented characteristics while excluding unrelated implementation details.

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