12.8 Boundary Between Part 1 and Part 2

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Part 1 defines conceptual meaning. Part 2 defines a platform-independent logical structure.

Part 2 may add logical relationships, constraints, interaction patterns, participation models, state relationships, and information-flow responsibilities. It does not change the definitions in Part 1.

When Part 2 requires a new concept not defined in Part 1, authors should either:

• Add the concept to Part 1 if it belongs to the conceptual foundation
• Define it in Part 2 as a logical concept if it belongs only to the logical architecture

This boundary prevents the Logical Architecture / PIM from becoming an implementation profile and prevents conceptual definitions from drifting across later parts.