anchor.diff:                          "observedFrom": "2016-10-13T12:00:00Z",
                           "observedUntil": "2016-10-13T12:00:00Z",
                           "observedPeriod" : "PT0S",
  -
                           "airTemperatureInCelsius": 29.6,
                           "airTemperatureInFahrenheit" : 85.28,
   
  
positive.code: *Fields mapping*
  
  Common names of filed which can be included in all periods: meteoGroupStationId,meteoGroupStationName,stationLocation,stationTimeZoneName
  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
  
negative.code:                     }
                  ]
              }
  
  # Group Forecast
  
  