code: @Override
  	public EClass getIfcSystem() {
  		if (ifcSystemEClass == null) {
  			ifcSystemEClass = (EClass) EPackage.Registry.INSTANCE.getEPackage(Ifc4Package.eNS_URI).getEClassifiers()
  					.get(691);
  		}
  		return ifcSystemEClass;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated