ifc-impl-version-migration

This skill is the workflow for migrating an IFC model from one schema version to another (IFC2x3, IFC4, IFC4.3). Migration is a structural transformation of the instance graph, NEVER a textual find-and-replace and NEVER a geometry or file-format conversion.

This skill teaches the concept and mechanics. It does NOT teach any library API. The reference implementation (ifcpatch Migrate) and the geometry tool (IfcConvert) are named only as pointers ; their API belongs to the Blender-Bonsai-ifcOpenShell package.

For the schema-evolution background see ifc-core-version-evolution. For diagnosing a version-mismatch failure see ifc-errors-version-mismatch.

Quick Reference

Migration is two ordered stages