Please mind that we mostly have focused to develop IFC schema based on “Relational or Object-Relational” approach
And I think @bsbock helped a lot in this way
It’s NOT about the database “FROM” .ifc file which the majority solved issues here and today the majority of solutions in the market convert the .ifc file to SQL
RDF, OWL, BerkleyDB and anything these days the majority use are good, but not great
I think the majority didn’t think about “Smoothness” and “Performance”