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 +====== P1-REQ-13-4-008 ======
  
 +[[dido:99_annexes:annex-d-requirements:part-01:start|Return to Part 1 Requirements]]
 +
 +===== Statement =====
 +
 +A [[dido:99_annexes:annex-b-terms-and-definitions:d:data_structure_instance|Data Structure Instance]] SHALL identify a populated occurrence of a [[dido:99_annexes:annex-b-terms-and-definitions:d:data_structure_definition|Data Structure Definition]].
 +
 +===== Source =====
 +
 +Part 1, Section 13.4: Core Conceptual Element Requirements.
 +
 +===== Rationale =====
 +
 +A Data Structure Instance represents a populated occurrence of a Data Structure Definition. This distinction separates the definition of a class of information from a specific occurrence of information that conforms to that definition.
 +
 +This requirement supports traceability between definitions and instances and prevents a populated occurrence from redefining the information class.
 +
 +===== Applies To =====
 +
 +This requirement applies to Data Structure Instance references within the Conceptual Architecture.
 +
 +It applies specifically to:
 +
 +  * Populated information occurrences
 +  * Definition-to-instance relationships
 +  * Instance interpretation
 +  * Information traceability
 +  * Data Structure Instance descriptions
 +
 +===== Verification =====
 +
 +Verification SHALL confirm that each Data Structure Instance identifies a populated occurrence of a Data Structure Definition.
 +
 +Verification activities include review checks confirming that:
 +
 +  * Data Structure Instances identify populated occurrences
 +  * Each Data Structure Instance relates to a Data Structure Definition
 +  * Data Structure Instances do not redefine Data Structure Definitions
 +  * Instance references remain distinct from definition references
 +
 +===== 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-13-4-012:start]]
 +
 +===== Status =====
 +
 +Draft
 +
 +----
 +
 +<WRAP centeralign>
 +© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
 +</WRAP>