P4-REQ-21-6-011 [Dido Solutions, Inc Wiki]

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====== P4-REQ-21-6-011 ======

[[dido:99_annexes:annex-d-requirements:part-04:start| Return to Requirements]]

===== Statement =====

IDL structures SHALL NOT redefine FX logical information structures.

===== Source =====

Part 4, Section 21.6: Information Structure Mapping Requirements.

===== Rationale =====

IDL structures are selected Phase 0 implementation representations of logical information structures. They define implementation-level data representation, not architectural meaning.

Preventing IDL structures from redefining logical information preserves the authority of the Part 3 FX Demo Logical Profile and allows implementation representations to evolve independently under governance.

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

This requirement applies to:

  * IDL structures;
  * source IDL files;
  * generated types;
  * DDS Topic mappings; and
  * FX logical information structures.

===== Verification =====

Verification SHALL confirm that IDL structures do not redefine FX logical information structures.

Verification activities should include review checks confirming that:

  * logical information meaning remains governed by Part 3;
  * IDL structures are treated as implementation representations;
  * implementation-specific fields or constraints do not silently alter logical meaning; and
  * changes affecting logical meaning are governed at the applicable logical layer.

===== Traceability =====

This requirement preserves the separation between Part 3 FX logical information structures and their Phase 0 IDL representations.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-6-002]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-6-010]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-6-012]]

Related source section:

  * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-6-information-structure-mapping-requirements:start]]

===== Status =====

Draft

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