FUNCTION IfcMlsTotalThickness
(LayerSet : IfcMaterialLayerSet) : IfcLengthMeasure;
  LOCAL
    Max : IfcLengthMeasure := LayerSet.MaterialLayers[1].LayerThickness;    
  END_LOCAL;

  IF SIZEOF(LayerSet.MaterialLayers) > 1 THEN
    REPEAT i := 2 TO HIINDEX(LayerSet.MaterialLayers);
       Max := Max + LayerSet.MaterialLayers[i].LayerThickness;
    END_REPEAT;
  END_IF;
  RETURN (Max);
END_FUNCTION;