P4-REQ-21-2-004

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The Phase 0 Implementation Profile / PSM SHALL NOT redefine Part 1 conceptual elements, Part 2 logical elements, or Part 3 FX logical profile elements.

Part 4, Section 21.2: Phase 0 Profile Requirements.

Part 4 realises architectural elements defined by preceding parts. Allowing implementation decisions to redefine those elements would collapse the separation between conceptual, logical, FX logical, and implementation concerns.

This constraint preserves the authority of Parts 1, 2, and 3 over their respective architectural definitions.

This requirement applies to:

• Phase 0 implementation mappings;
• implementation artefacts;
• implementation technologies;
• implementation conventions; and
• implementation governance decisions.

Verification SHALL confirm that the Phase 0 Implementation Profile / PSM does not redefine elements governed by Parts 1, 2, or 3.

Verification activities should include review checks confirming that:

• implementation mappings realise rather than redefine logical elements;
• implementation technology choices do not alter logical meaning;
• implementation conventions remain subordinate to the applicable architectural definitions; and
• changes to conceptual or logical meaning are governed in the applicable preceding part rather than introduced through Part 4.

This requirement preserves the separation of architectural layers and maintains the authority of Parts 1, 2, and 3 over their defined elements.

Related requirement identifiers:

• P4-REQ-21-2-003
• P4-REQ-21-2-005
• P4-REQ-21-2-007

Related source section:

• 21.2 Phase 0 Profile Requirements

Draft