====== 6.1 Overview ======
[[fxdemo:03-part:06-fx-demo-logical-node-model:start | Go To FX Demo Logical Node Model ]]

The FX Demo Logical Node Model specializes the Part 2 [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_node|Logical Node]] Model for the [[dido:99_annexes:annex-b-terms-and-definitions:f:foreign_exchange_domain|Foreign Exchange Domain]].

An FX logical [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_node|Node]] represents a platform-independent participant in the FX Demo Logical Profile. Each FX logical [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_node|Node]] performs one or more FX logical [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_node_role|Node Roles]], participates in one or more FX logical [[dido:99_annexes:annex-b-terms-and-definitions:r:runtime_plane|Runtime Planes]], uses one or more FX logical [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_communication_endpoint|Communication Endpoints]], and handles one or more FX logical information structures.

The FX Demo Logical Node Model identifies logical responsibilities before later parts select execution mechanisms or deployment mechanisms. Part 4 maps FX logical [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_node|Nodes]] to implementation artifacts. Part 5 deploys, tests, observes, and provides [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]] for those implementation artifacts.

The FX Demo Logical Node Model does not prescribe processes, services, containers, pods, virtual machines, libraries, threads, tasks, [[dido:99_annexes:annex-b-terms-and-definitions:r:rpc|RPC]] endpoints, [[dido:99_annexes:annex-b-terms-and-definitions:r:rest|REST]] resources, [[dido:99_annexes:annex-b-terms-and-definitions:d:dds|DDS]] participants, or deployment artifacts. Implementation and deployment profiles select those realization mechanisms.

Figure 6-1 summarises the primary FX logical Nodes used by the FX Demo Logical Profile.

<code>
FX Demo Logical Node Network
├── FX Transaction Intake Node
├── FX Validation Node
├── FX Semantic Interpretation Node
├── FX Contract State Node
├── FX Cash-Flow Computation Node
├── FX Policy and Release Node
├── FX Audit and Provenance Node
├── FX Health and Observability Node
├── FX Registry and Coordination Node
├── FX Replay and Reconstruction Node
└── External Oversight Participant
</code>

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**Figure 6-1:** FX Demo Logical Node Network.
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