anchor.diff:  *Fields mapping*
   
   Common names of filed which can be included in all periods: meteoGroupStationId,meteoGroupStationName,stationLocation,stationTimeZoneName
  +
  +Here are relationship between observation period and fields:
  +
   PT0S - airTemperatureInCelsius,airTemperatureInFahrenheit,feelsLikeTemperatureInCelsius,feelsLikeTemperatureInFahrenheit,airPressureInHpa,
   windSpeedInMeterPerSecond,windSpeedInKilometerPerHour,windSpeedInMilePerHour,windSpeedInBeaufort,windSpeedInKnot,windDirectionInDegree,
   dewPointTemperatureInCelsius,dewPointTemperatureInFahrenheit,relativeHumidityInPercent100based,effectiveCloudCoverInOcta,visibilityInMeter,
   visibilityInKilometers,visibilityInNauticalMile,visibilityInStatuteMile,presentWeather,weatherSymbol
  +
   PT1H - windGustInMeterPerSecond,windGustInKilometerPerHour,windGustInMilePerHour,windGustInBeaufort,windGustInKnot,precipitationAmountInMillimeter,precipitationAmountInInch
  +
   PT3H - pressureTendencyCode,pressureChangeInHectoPascal
  +
   PT12H - temperatureMaxInDegreeCelsius,temperatureMaxInFahrenheit,temperatureMinInDegreeCelsius,temperatureMinInFahrenheit
  +
   PT24H - precipitationAmountInMillimeter,precipitationAmountInInch,sunshineDurationInHours
   
   + Parameters
  
positive.code:                     }
                  ]
              }
  
  
  
  # Group Forecast
  
  
negative.code:                         "observedFrom": "2016-10-13T12:00:00Z",
                          "observedUntil": "2016-10-13T12:00:00Z",
                          "observedPeriod" : "PT0S",
                          "airTemperatureInCelsius": 29.6,
                          "airTemperatureInFahrenheit" : 85.28,
  
  