(Authoritative Open Group guidance distinguishes conceptual, logical, and physical concerns; at the logical level, component types are identified independently of implementation.) For example, the Open Group’s metamodel guidance emphasizes technology-agnostic structure to ensure consistency within an architecture description, which is precisely what the logical level captures before physical realization.
“The Content Metamodel defines a formal structure… to ensure consistency within the architecture description and also to provide guidance for organizations that wish to implement their architecture within an architecture tool.” Open Group Publications
[Reference: The Open Group, TOGAF 9 Conformance Requirements (Content Framework overview); Open Group Whitepaper TOGAF 9 Conformance Requirements—Content Metamodel description., Note: TOGAF Series Guides (member library) explicitly define the four abstraction levels; the logical level focuses on the “what (structure) independent of technology.” The cited Content Metamodel text underpins this by mandating technology-agnostic structure for consistency., ===========]
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