====== P4-REQ-21-7-007 ======

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

===== Statement =====

Cross-plane implementation relationships SHALL preserve the distinct architectural purpose of each Runtime Plane involved.

===== Source =====

Part 4, Section 21.7: Runtime Plane Realization Requirements.

===== Rationale =====

Phase 0 implementation interactions may involve more than one Runtime Plane, but shared implementation mechanisms must not erase the architectural distinctions among those concerns.

Preserving each Runtime Plane's purpose allows cross-plane interactions to remain understandable, traceable, governable, and reviewable.

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

This requirement applies to:

  * cross-plane DDS exchanges;
  * shared implementation participants;
  * cross-plane logging and exception handling;
  * audit and provenance relationships;
  * policy and release relationships; and
  * cross-plane implementation mappings.

===== Verification =====

Verification SHALL confirm that cross-plane implementation relationships preserve the distinct purpose of every Runtime Plane involved.

Verification activities should include review checks confirming that:

  * each Runtime Plane role remains identifiable;
  * shared implementation mechanisms do not merge architectural meaning;
  * mappings identify all applicable Runtime Planes;
  * governance and traceability remain plane-aware; and
  * cross-plane behavior is documented where applicable.

===== Traceability =====

This requirement preserves separation of concerns across Phase 0 Runtime Plane implementation relationships.

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-21-7-002]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-7-003]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-7-004]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-7-005]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-7-006]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-7-008]]

Related source section:

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

===== Status =====

Draft

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