Jon Mirtschin

I would describe most relationships as one to many, rather than many to many. Ie one material related to multiple instances/types. One attribute is plural, the other singular (ie RelatingObject...

We're in agreement here, I misread your description in the post prior.

I believe PSD is a bespoke data serialization. They are also published in accordance with IFC which is an ISO standard. You can find the ifcxml file listed on this...

This is the right place to raise the issue, but to get a broader buildingSMART perspective/discussion, I've opened a forum post on this issue. https://forums.buildingsmart.org/t/xsd-optional-attributes/1641

The faces are inline for Triangulate Face Set, but I would suggest the logic for polygonal is that a face can have inner loops via the subclass https://standards.buildingsmart.org/IFC/DEV/IFC4_3/RC1/HTML/link/ifcindexedpolygonalfacewithvoids.htm It is...

Thanks for the question, it's a good point. At present the attributes are nested into xml files to preserve the order, and increase efficiency in terms of writing lots of...

Constraint relationships like this are not explicitly supported in IFC at this point in time. If it's a one to one relationship, in my developments I have supported a user...

I don't recall this explanation of the scope of structural analysis exchange. It makes sense, but the official documentation contradicts it noting the word "all". https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcStructuralAnalysisModel.htm > The [IfcStructuralAnalysisModel](https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcStructuralAnalysisModel.htm) is...

> > > so the IfcSite GUID in the shared parameters file is actually obsolete - we now have IfcSite GUID, IfcBuilding GUID and IfcProject GUID as built-in parameters (in...

IFC instance properties can be mapped from type and instance parameters. I didn't go study the code to see which is searched first, but it's hard coded into the plugin....