====== 3.4 Traceability to Part 2 Distributed Node-Based Logical Architecture / Platform-Independent Model (PIM) ======

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Part 2 defines the reusable, distributed, node-based Logical Architecture / [[dido:99_annexes:annex-b-terms-and-definitions:p:platform_independent_model|Platform-Independent Model (PIM)]]. This part preserves that logical architecture by mapping selected Part 2 logical concepts, as specialized by Part 3, to Phase 0 implementation artifacts.

The Phase 0 Implementation Profile realizes selected logical [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_node|Nodes]] as implementation participants, selected logical [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_communication_endpoint|Communication Endpoints]] as [[dido:99_annexes:annex-b-terms-and-definitions:d:dds|DDS]] Topics or equivalent communication artifacts, selected logical information structures as [[dido:99_annexes:annex-b-terms-and-definitions:i:idl|IDL]] structures and generated types, selected [[dido:99_annexes:annex-b-terms-and-definitions:r:runtime_plane|Runtime Plane]] distinctions as implementation conventions, and selected logical interaction patterns as implementation-level message flows or command flows.

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**Table 3-4:** Part 2 logical elements realized by the Phase 0 Implementation Profile.
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^ Part 2: Logical Element ^ Part 4: Phase 0 implementation treatment ^
| Logical Node | Realized by selected implementation Nodes, modules, processes, or runtime participants. |
| Logical Node Role | Realized by implementation responsibilities, modules, functions, or service behaviors. |
| Logical Communication Endpoint | Realized by [[dido:99_annexes:annex-b-terms-and-definitions:d:dds|DDS]] Topics or other selected communication artifacts. |
| Logical Data Structure Definition | Realized by [[dido:99_annexes:annex-b-terms-and-definitions:i:idl|IDL]] structures, generated types, and implementation data definitions. |
| Logical Data Structure Instance | Realized by DDS samples, runtime messages, commands, acknowledgements, records, and generated type instances. |
| Logical Runtime Plane | Realized through implementation conventions that distinguish Control, Data, Health and Observability, Policy and Release, and Audit and Provenance concerns. |
| Logical Interaction Pattern | Realized by implementation-level communication flows, command flows, processing steps, scripts, or orchestration conventions. |
| Logical Governance Model | Realized through implementation versioning, compatibility rules, generation rules, repository conventions, and review controls. |
| Logical Traceability Model | Realized through mapping tables, file headers, generated artifact metadata, repository metadata, and [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|traceability]] records. |

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