CMDBuild Forum

IFC import template — cannot map custom Pset properties to attributes (IfcWall instance)

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#1

Hello,

I’m running CMDBuild 4.2 / openMAINT 5 and I’m trying to import walls from an IFC4 file (exported from Revit) as Asset cards, mapping custom property set values to my class attributes.

Setup:

I created a custom Pset in Revit (Pset_Asset) with the following instance-level properties on IfcWall:

  • AssetTag
  • AssetManufacturer
  • ModelReference

I verified in BIMvision/Navisworks that these properties are correctly exported on the IfcWall instance (not on IfcWallType) under Pset_Asset, with values such as:

Pset_Asset
  AssetManufacturer: Carrier
  AssetTag: 01
  ModelReference: BTC07

My import template (Wall Import from IFC):

  • Apply on: Class = Wall
  • IFC entity path: IfcWall
  • Attribute mappings:
    • Code → AssetTag
    • Name → Name
    • Model → ModelReference
    • Supplier → AssetManufacturer

The problem:

  • Code and Name import correctly (these are direct IFC attributes)
  • Model and Supplier, mapped to the custom Pset properties ModelReference and AssetManufacturer, are always imported empty

What I’ve tried:

  1. Plain property name: ModelReference → doesn’t work
  2. Full traversal path (as documented on the OSArch wiki):
   IsDefinedBy[RelatingPropertyDefinition/Name="Pset_Asset"]/RelatingPropertyDefinition/HasProperties[Name="ModelReference"]/NominalValue/wrappedValue

→ doesn’t work
3. Type-relationship traversal:

   IsTypedBy/RelatingType/IsDefinedBy[RelatingPropertyDefinition/Name="Pset_Asset"]/RelatingPropertyDefinition/HasProperties[Name="ModelReference"]/NominalValue/wrappedValue

→ doesn’t work

None of these produce an error — the import just completes with the Model and Supplier fields left blank.

Question:

What is the correct syntax for the “IFC property” field in the import template to read a value from a custom property set on an IfcWall instance? Is there a working example/documentation for this specific use case? I see a similar unanswered question from another user here: BIM IFC4 Mapping Pset standard

Any help would be greatly appreciated — this seems to be a fairly common need for asset management use cases (manufacturer/model info from custom Psets) but I can’t find a single working example anywhere.

Thanks!