About IFC Header section

[claimred]

It looks like schema_identifiers filed should also be clarified in the header implementation guide.

According to several questions here:

Versioning in the IFC-file

I have seen a list of schema identifiers in IfcOpenShell: https://github.com/IfcOpenShell/IfcOpenShell/blob/f01ae4a45b3fc294ab5bcd4de494cc446ac587dc/cmake/CMakeLists.txt#L462 set(SCHEMA_VERSIONS "2x3" "4" "4x1" "4x2" "4x3_rc1") I don’t know if they are official buildingSMART ones, or specific to IfcOpenShell. If buildingSMART does indeed have a list of official identifiers, then indeed, perhaps the vendors are just neglecting them or are unaware Would be interested to know the …

FILE_SCHEMA vs. Schema Version

Hello all, we faced some difficulties to import IFC4 files. The FILE_SCHEMA tag indicated IFC4 FILE_SCHEMA((‘IFC4’), but finally it contains data based on Schema version 4.0.2, IFC4 Add2, with some new items. As we are using a generative importer to make sure the schema is correct, we like to know the real schema content of a file and not only the major version. Version 4 already has a lot of addendum and extensions. So I like to know how to judge the correct Schema Version of an IFC4 file. Ma…