IFC Core : Version Evolution

IFC has evolved across four published schema generations (IFC2x3, IFC4, the withdrawn IFC4.1 / IFC4.2 stepping-stones, and IFC4.3) plus the in-development IFC5 / IFCx. Each step added entities and, critically, introduced renames and deprecations that break files across versions. This skill is the reference for what changed and when. It is the read-side counterpart to ifc-impl-version-migration, which covers the how-to of migrating a model.

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Version ledger