The IfcWallStandardCase defines a wall with certain constraints for the provision of parameters and with certain constraints for the geometric representation. The IfcWallStandardCase handles all cases of walls, that are extruded vertically:along the positive z axis of the wall object coordinate system, and along the positive z axis of the global (world) coordinate systemand have a single thickness along the path for each wall layer, i.e.:parallel sides for straight walls co-centric sides for curved walls.and have either:a straight line axis (straight wall), or a circular arc axis (round wall).and shall not haveaggregated components, that is, parts aggregated to a wall by IfcRelAggregates shape representation for 'Body' not being an extrusion, or clipped extrusionThe following parameter have to be provided:Wall height, taken from the depth of extrusion, provided by the geometric representation. Wall thickness, taken from the material layer set usage, attached to the wall Wall offset from axis, taken from the material layer set usage, attached to the wallThe IfcWallStandardCase requires the provision of the wall axis either a straight line that is parallel to the x-axis of the object coordinate system, or a circular arc where the tangent at start is parallel to the x-axis of the object coordinate system. The direction of the wall axis shall be the positive direction of that x-axis.The material of the wall is defined by the IfcMaterialLayerSetUsage and is attached by the IfcRelAssociatesMaterial objectified relationship. It is accessible by the inverse HasAssociations relationship. The material layer set usage has to be given (enforced by where rule).An 'Axis' and a 'Body' shape representation has to be provided, and it is invalid to exchange a 'Tessellation', 'SurfaceModel', 'Brep' or 'MappedRepresentation' representation for the 'Body' shape representation of the IfcWallStandardCase.HISTORY New entity in IFC2x.