2. Relationship to Parts 0, 1, and 2

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Part 0 provides the Document Set Overview and Reader's Guide for the Financial Systems Archetype. It explains the purpose of the document set, the relationship to SDIS/SIP-RA, the layered document structure, the onion model, document responsibilities, layering rules, and navigation guidance.

Part 1 defines the Conceptual Architecture for the Financial Systems Archetype. It establishes the conceptual definitions, classification model, separation-of-concerns model, Runtime Plane concepts, Traceability concepts, Evidence concepts, and conceptual requirements that later parts preserve.

Part 2 defines the Distributed Node-Based Logical Architecture (PIM). It specializes the Part 1 conceptual foundation into reusable platform-independent Logical Nodes, Logical Node Roles, Logical Communication Endpoints, logical information structures, Logical Runtime Planes, Logical Interaction Patterns, Logical Governance relationships, and Logical Traceability relationships.

This part depends on Parts 0, 1, and 2. It relies on Part 0 for the document-set map and layering rules. It relies on Part 1 for the conceptual foundation. It relies on Part 2 for the reusable, distributed, node-based Logical Architecture.

Part 3 performs the third architectural role within the document set. It specializes the Part 2 Logical Architecture / PIM for the Foreign Exchange Domain. It defines the FX Demo Logical Profile without introducing implementation technologies, deployment mechanisms, product choices, runtime scripts, or Evidence procedures.

Table 2-1: Relationship among Parts 0, 1, 2, and 3.

Part	Role
Part 0	Explains how to read and use the Financial Systems Archetype document set.
Part 1	Defines the Conceptual Architecture used by the Financial Systems Archetype document set.
Part 2	Defines the Distributed Node-Based Logical Architecture (PIM).
Part 3	Defines the FX Demo Logical Profile as a Foreign Exchange Domain specialization of Part 2.

Part 0 tells readers how the document set works. Part 1 defines the concepts at the centre of the architecture. Part 2 defines the reusable platform-independent Logical Architecture. Part 3 applies that Logical Architecture to the FX Demo.

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