====== 12.8 Boundary Between Part 1 and Part 2 ======
[[fxdemo:01-part:start | Go to Top ]]

Part 1 defines conceptual meaning. Part 2 defines a [[dido:99_annexes:annex-b-terms-and-definitions:p:platform_independent_model|Platform Independent Model (PIM)]] logical [[dido:99_annexes:annex-b-terms-and-definitions:s:structure|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 [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_model|Logical Architecture]].

This boundary prevents the [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_model|Logical Architecture]] / [[dido:99_annexes:annex-b-terms-and-definitions:p:platform_independent_model|PIM]] from becoming an implementation profile and prevents conceptual definitions from drifting across later parts.

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