====== P4-REQ-21-13-004 ======

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

===== Statement =====

Implementation governance SHALL define implementation compatibility.

===== Source =====

Part 4, Section 21.13: Implementation Governance Requirements.

===== Rationale =====

Phase 0 implementation artifacts must work together without loss of logical meaning, communication compatibility, generated-type compatibility, QoS compatibility, traceability, or reviewability.

Defined compatibility rules allow incompatible changes to be detected and reviewed before they enter the implementation baseline.

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

This requirement applies to:

  * DDS Topic mappings;
  * publishers and subscribers;
  * IDL structures and generated types;
  * QoS profiles;
  * configuration artifacts; and
  * implementation modules.

===== Verification =====

Verification SHALL confirm that implementation governance defines implementation compatibility.

Verification activities should include review checks confirming that:

  * communication compatibility is addressed;
  * data-representation compatibility is addressed;
  * QoS compatibility is addressed;
  * version relationships are considered; and
  * incompatible artifacts require review before baseline acceptance.

===== Traceability =====

This requirement establishes compatibility controls among related Phase 0 implementation artifacts.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-13-003]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-13-005]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-5-009]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-6-009]]

Related source section:

  * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-13-implementation-governance-requirements:start]]

===== Status =====

Draft

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