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agreement on how to use material layer set and usage for wall types
based on
extended coordination view
24. Nov. 2006
ISG meeting in Dijon
summary agreement on how to use material layer set and usage for wall types



For the implementation of IfcStandardWall with an associated IfcWallType within the IFC2x3 extended coordination view the following agreements are made:

  • the IfcWallType is supported, but is not mandatory for export
if an IfcWallType is exported for a standard wall, then the following specification on assigning material information to both, the IfcWallStandardCase and the IfcWallType needs to be met.
  • for each IfcWallStandardCase, an IfcMaterialLayerSetUsage is assigned (general rule according to the IFC specification)
  • all wall occurrences being of type IfcWallStandardCase and belonging to one wall type are assigned to one instance of IfcWallType
  • the IfcMaterialLayerSetUsage's attached to all instances of IfcWallStandardCase belonging to the same IfcWallType shall reference the same instance of IfcMaterialLayerSet.
  • this instance of IfcMaterialLayerSet is assigned to the IfcWallType


The following figure shows the correct assignment of IfcMaterialLayerSetUsage and IfcMaterialLayerSet to IfcWallStandardCase and IfcWallType