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 +====== P1-REQ-13-4-012 ======
  
 +[[dido:99_annexes:annex-d-requirements:part-01:start|Return to Part 1 Requirements]]
 +
 +===== Statement =====
 +
 +The Conceptual Architecture SHALL distinguish a [[dido:99_annexes:annex-b-terms-and-definitions:d:data_structure_definition|Data Structure Definition]] from a [[dido:99_annexes:annex-b-terms-and-definitions:d:data_structure_instance|Data Structure Instance]].
 +
 +===== Source =====
 +
 +Part 1, Section 13.4: Core Conceptual Element Requirements.
 +
 +===== Rationale =====
 +
 +A Data Structure Definition describes the structure, meaning, and constraints of a class of information. A Data Structure Instance identifies a populated occurrence of that definition.
 +
 +Distinguishing definition from instance prevents a single occurrence of information from redefining the class of information and supports consistent interpretation, validation, and traceability.
 +
 +===== Applies To =====
 +
 +This requirement applies to Data Structure Definition and Data Structure Instance references within the Conceptual Architecture.
 +
 +It applies specifically to:
 +
 +  * Definition-to-instance relationships
 +  * Information classes
 +  * Populated occurrences
 +  * Information interpretation
 +  * Information traceability
 +
 +===== Verification =====
 +
 +Verification SHALL confirm that the Conceptual Architecture distinguishes Data Structure Definitions from Data Structure Instances.
 +
 +Verification activities include review checks confirming that:
 +
 +  * Data Structure Definitions describe classes of information
 +  * Data Structure Instances identify populated occurrences
 +  * Instances reference definitions without redefining them
 +  * Diagrams and text preserve the distinction between definition and instance
 +
 +===== Traceability =====
 +
 +Related source section:
 +
 +  * [[fxdemo:01-part:13-conceptual-requirements:13-4-core-conceptual-element-requirements]]
 +
 +Related requirement identifiers:
 +
 +  * [[dido:99_annexes:annex-d-requirements:part-01:p1-req-13-4-001:start]]
 +  * [[dido:99_annexes:annex-d-requirements:part-01:p1-req-13-4-007:start]]
 +  * [[dido:99_annexes:annex-d-requirements:part-01:p1-req-13-4-008:start]]
 +  * [[dido:99_annexes:annex-d-requirements:part-01:p1-req-13-4-011:start]]
 +
 +===== Status =====
 +
 +Draft
 +
 +----
 +
 +<WRAP centeralign>
 +© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
 +</WRAP>