code: public EClass getIfcWaterProperties() {
  		if (ifcWaterPropertiesEClass == null) {
  			ifcWaterPropertiesEClass = (EClass) EPackage.Registry.INSTANCE.getEPackage(Ifc2x3tc1Package.eNS_URI)
  					.getEClassifiers().get(644);
  		}
  		return ifcWaterPropertiesEClass;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated