====== P2-REQ-16-5-001 ======

[[dido:99_annexes:annex-d-requirements:part-02:start| Return to Requirements]]

===== Statement =====

The Logical Architecture / PIM SHALL define [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_data_structure_definition|Logical Data Structure Definition]] and [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_data_structure_instance|Logical Data Structure Instance]].

===== Source =====

Part 2, Section 16.5: Logical Information Requirements.

===== Rationale =====

The Logical Information Model requires both Logical Data Structure Definitions and Logical Data Structure Instances to distinguish reusable information definitions from their populated occurrences. This distinction supports platform-independent modeling, governance, interoperability, validation, traceability, and implementation mapping.

Without these concepts, the Logical Architecture could not consistently distinguish information definitions from the information exchanged among Logical Nodes.

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

This requirement applies to the Logical Information Model.

It applies specifically to:

  * Logical Data Structure Definitions;
  * Logical Data Structure Instances;
  * Logical Information Model; and
  * Domain Logical Profiles.

===== Verification =====

Verification SHALL confirm that the Logical Architecture / PIM defines both Logical Data Structure Definitions and Logical Data Structure Instances.

Verification activities should include review checks confirming that:

  * Logical Data Structure Definitions are explicitly defined;
  * Logical Data Structure Instances are explicitly defined;
  * the distinction between definitions and instances is maintained; and
  * both concepts remain platform independent.

===== Traceability =====

This requirement supports traceability between logical information definitions, logical information instances, and the information exchanged among Logical Nodes.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-02:p2-req-16-5-002]]
  * [[dido:99_annexes:annex-d-requirements:part-02:p2-req-16-5-003]]
  * [[dido:99_annexes:annex-d-requirements:part-02:p2-req-16-5-004]]

Related source section:

  * [[fxdemo:02-part:16-logical-requirements:16-5-logical-information-requirements:start]]

===== Status =====

Draft

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