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12.3 Logical Architecture Preserves Conceptual Meaning
The Logical Architecture / PIM preserves the meaning of the conceptual elements defined in Part 1.
A logical element may specialise, refine, constrain, or relate a conceptual element. It does not redefine the conceptual element. A Logical Node remains a specialisation of Node. A logical endpoint remains a specialisation of Communication Endpoint. A logical information structure remains a specialisation of Data Structure Definition. A logical plane remains a specialisation of the Runtime Plane.
Preserving conceptual meaning maintains the architecture’s onion structure. The logical layer builds outward from the conceptual layer rather than replacing it.