code: @Override
  	public EClass getIfcTimePeriod() {
  		if (ifcTimePeriodEClass == null) {
  			ifcTimePeriodEClass = (EClass) EPackage.Registry.INSTANCE.getEPackage(Ifc4Package.eNS_URI).getEClassifiers()
  					.get(722);
  		}
  		return ifcTimePeriodEClass;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated