P4-REQ-21-7-007

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

Part 4, Section 21.7: Runtime Plane Realization Requirements.

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.

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 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.

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

Related requirement identifiers:

• P4-REQ-21-7-001
• P4-REQ-21-7-002
• P4-REQ-21-7-003
• P4-REQ-21-7-004
• P4-REQ-21-7-005
• P4-REQ-21-7-006
• P4-REQ-21-7-008

Related source section:

• 21.7 Runtime Plane Realization Requirements

Draft