Proposal to remove IfcPropertySetDefinitionSelect / IfcPropertySetDefinitionSet

I am the only person, after how many years of IFC radiation exposure, of being surprised by this? :) https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPropertySetDefinitionSelect.htm

Would love to hear if there's something I'm missing, but from what I can tell this is merely an anomaly that changes the usual 1:N relationship classes into a N:N relationship ... and it's sometimes 1:N, sometimes N:N. Surely this would trip up lots of people.

Is the semantics of "this group of properties is related to that group of elements" so important?

Start with the linked IFC4x3 lexical page for IfcPropertySetDefinitionSelect and IfcPropertySetDefinitionSet, then compare the documented 1:N and N:N relationship semantics. The issue does not name implementation files or tests; done would require a maintainer decision on whether these constructs should be removed and corresponding specification updates.

Written by the indexing model from the issue text.