Dion Moult

Proposal for new Qto_GeographicElementBaseQuantities

2

Geographic elements, which are becoming increasingly more relevant do not have any dedicated base quantities Qto for them. The only Qto they have officially is Qto_BodyGeometryValidation which is more intended...

IfcMaterialProfileSetUsageTapering cannot specify the second profile at the type level

2

For all other material sets, they can specify the profile(s) / layer(s) at the relating type. Then, all occurrences of that type will have a material set usage pointing to...

Make Placement of IfcTextLiteral optional

2

Placement is currently mandatory for IfcTextLiteral. This seems inconsistent. I propose to make it optional (and therefore default to an identity matrix) which is the same behaviour for other types...

IfcVirtualElementType or IfcAnnotationType should exist

1

Currently IfcVirtualElement and IfcAnnotation have no corresponding type. (e.g. so you can't have a type of dimension annotation) The only workaround right now is to use IfcTypeProduct which has this...

Standardised psets for storing data about surveyed points (IfcAnnotation)

2

IFC4X3 introduces Pset_AnnotationSurveyArea which is great (seems to be missing the applicable type restriction to `ASBUILTAREA`?). Notably missing is properties related to individual survey points. Proposal to add Pset_AnnotationSurveyPoint. The...

Is IfcAnnotation predefinedtype incomplete or deprecating some of the prior suggested userdefined types?

1

In IFC4 the documentation of IfcAnnotation recommends certain userdefined types such as "SurveyPoint", "SurveyArea", "ContourLine", "IsoBar", "IsoLux", etc. In IFC4X3, IfcAnnotation as a leaf node has added new enumerated PredefinedTypes...

I was looking at https://github.com/buildingSMART/Sample-Test-Files/blob/master/IFC%202x3/Duplex%20Apartment/Duplex_A_20110907.ifc and noticed it had no geometric subcontexts (e.g. for body). This means that the geometric context is ambiguous. It's technically not invalid (though I'd argue...

https://github.com/buildingSMART/Sample-Test-Files/raw/master/IFC%202x3/SDK%20-%20S1/1.%20IFC%20models%20-%20modellen/01%20Engineering%20models%20-%20Engineeringsmodellen/E-S1-RWB-Geelen-Beton%2001%201e%20verdieping.ifc uses a Plan context with a dimensionality of 3. It also has a model footprint subcontext but no body subcontext.

Can you actually contain a distribution system in a building?

5

In the diagram here https://github.com/buildingSMART/IDS/blob/master/Documentation/UserManual/partof-facet.md it shows a distribution system contained in a building. I didn't know this was possible. I searched the IFC docs but could not find any...

Description of the proposal: Not exactly affecting the schema, but does affect Pset definition templates, and definitely affects the users experience as it removes an important ambiguity that I've seen...