====== P4-REQ-21-7-008 ======

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

===== Statement =====

Implementation mechanisms SHALL NOT collapse Runtime Plane distinctions.

===== Source =====

Part 4, Section 21.7: Runtime Plane Realization Requirements.

===== Rationale =====

Implementation mechanisms such as DDS, shared modules, common logging, repository groupings, or runtime packaging may support multiple architectural concerns. Those mechanisms must not become a substitute for the Runtime Plane distinctions defined by the logical architecture.

This constraint preserves separation of concerns even when Phase 0 uses shared implementation technologies or artifacts.

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

This requirement applies to:

  * DDS Topics and QoS profiles;
  * shared modules;
  * runtime packaging;
  * logging and exception-handling mechanisms;
  * repository organization; and
  * implementation participant mappings.

===== Verification =====

Verification SHALL confirm that Phase 0 implementation mechanisms do not collapse Runtime Plane distinctions.

Verification activities should include review checks confirming that:

  * distinct Runtime Plane purposes remain identifiable;
  * shared mechanisms retain plane-specific mappings where applicable;
  * configuration does not erase Runtime Plane classifications;
  * runtime packaging does not redefine plane boundaries; and
  * review records can distinguish implementation concerns by Runtime Plane.

===== Traceability =====

This requirement preserves the Runtime Plane separation defined by the FX Demo Logical Profile throughout the Phase 0 implementation baseline.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-7-001]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-7-007]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-3-009]]

Related source section:

  * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-7-runtime-plane-realization-requirements:start]]

===== Status =====

Draft

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