internal static IfcElement constructElement(string className, IfcObjectDefinition container, IfcObjectPlacement pl, IfcProductRepresentation r) { return constructElement(className, container, pl, r, null); } internal static IfcElement constructElement(string className, IfcObjectDefinition host, IfcObjectPlacement pl, IfcProductRepresentation r, IfcDistributionSystem system)