Klaus Aengenvoort

> (The structure above is illustrative, perhaps we could try to write it in Json-Notation, if is good for the discussion) In [Json schema](https://json-schema.org/) this could be defined like this:...

> @klacol this is also strongly related to the EIR: Yes, many thinks are related to EIR and Level of information need, e.g. * Classes in Classification systems * TypeObjects...

> The presence of exactly 1 IfcProject instance is currently required for the IFC file to be valid. Is this an requirement of the base schema, or of an model...

Thanks @pipauwel : All my files have been valid in XML Spy, but the tools "only" validates against the XML schema (the XSD). This is one point PRO WHERE RULES...

I like WHERE rules. They are implemented in XBim very well and that teached me a lot about the rules in valid IFC files. The fact, that implementers to not...

> This is of course nothing that didn't exist before, but with this requirement, it pays to have a common agreed implementation between vendors. yes, a data template is needed...

Good description, In my words: Every export of an IFC file shall contain `type objects` based on the `objects` in the model, even if the original model does not contain...

Ok, Jon, we could offer a very small piece of software, e.g. like a Notepad++ Plugin, that can open the XML files and offer a nice editing experience, e.g. like...

A PSet (again a set, not a list) is a fixed list of properties, for exactly one purpose. As we all know, the world is full of PSets, but more...

I second this, @timchipman and me had a discussion about that some time ago: https://github.com/buildingSMART/IfcDoc/issues/30 The code to transform GUID's between the two notations should be open, to be able...