15.2 Logical Nodes Remain Distinct from Runtime Deployments

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A Logical Node represents a platform-independent participant in the logical architecture. It does not represent a process, service, container, pod, virtual machine, serverless function, thread, task, library, subroutine, RPC endpoint, REST resource, DDS participant, or deployment artifact.

Implementation profiles select execution mechanisms that realize Logical Nodes. Deployment profiles then describe how those implementation artifacts run in a concrete environment.

A single runtime artifact implements several Logical Nodes when the selected implementation approach combines responsibilities. Several runtime artifacts implement a single Logical Node when the selected implementation approach distributes responsibility. Neither choice redefines the Logical Node.