IWXXM-3.0-ExtensionElementList
| Class (Package Name::Class Name) | Local extension block | Super Class (Package Name::Class Name) |
| METAR/SPECI::AerodromeRunwayState | Yes | |
| METAR/SPECI::AerodromeRunwayVisualRange | Yes | |
| METAR/SPECI::SPECI | Yes | |
| METAR/SPECI::AerodromeSeaCondition | Yes | |
| METAR/SPECI::AerodromeWindShear | Yes | |
| METAR/SPECI::MeteorologicalAerodromeTrendForecast | Yes | |
| METAR/SPECI::MeteorologicalAerodromeObservation | Yes | |
| METAR/SPECI::AerodromeCloud | Yes | |
| METAR/SPECI::METAR | Yes | |
| METAR/SPECI::AerodromeSurfaceWind | Yes | |
| METAR/SPECI::AerodromeHorizontalVisibility | Yes | |
| TAF::MeteorologicalAerodromeForecast | Yes | |
| TAF::AerodromeAirTemperatureForecast | Yes | |
| TAF::TAF | Yes | |
| SIGMET::SIGMETPosition | Yes | |
| SIGMET::SIGMET | Yes | |
| SIGMET::SIGMETEvolvingCondition | Yes | |
| SIGMET::SIGMETEvolvingConditionCollection | Yes | |
| SIGMET::TropicalCycloneSIGMET | SIGMET::SIGMET | |
| SIGMET::VolcanicAshSIGMET | SIGMET::SIGMET | |
| SIGMET::SIGMETPositionCollection | Yes | |
| SIGMET::TropicalCycloneSIGMETEvolvingConditionCollection | Yes | SIGMET::SIGMETEvolvingConditionCollection |
| SIGMET::VolcanicAshSIGMETEvolvingConditionCollection | SIGMET::SIGMETEvolvingConditionCollection | |
| SIGMET::VolcanicAshSIGMETPositionCollection | SIGMET::SIGMETPositionCollection | |
| SIGMET::TropicalCycloneSIGMETPositionCollection | Yes | SIGMET::SIGMETPositionCollection |
| AIRMET::AIRMETEvolvingConditionCollection | Yes | |
| AIRMET::AIRMETEvolvingCondition | Yes | |
| AIRMET::AIRMET | Yes | |
| Tropical Cyclone Advisory::TropicalCycloneForecastConditions | Yes | |
| Tropical Cyclone Advisory::TropicalCycloneAdvisory | Yes | |
| Tropical Cyclone Advisory::TropicalCycloneObservedConditions | Yes | |
| Volcanic Ash Advisory::VolcanicAshCloudObservedOrEstimated | Yes | |
| Volcanic Ash Advisory::VolcanicAshAdvisory | Yes | |
| Volcanic Ash Advisory::WindObservedOrEstimated | Yes | |
| Volcanic Ash Advisory::VolcanicAshForecastConditions | Yes | |
| Volcanic Ash Advisory::VolcanicAshCloudForecast | Yes | |
| Volcanic Ash Advisory::VolcanicAshObservedOrEstimatedConditions | Yes | |
| Space Weather Advisory::SpaceWeatherRegion | Yes | |
| Space Weather Advisory::SpaceWeatherAdvisory | Yes | |
| Space Weather Advisory::SpaceWeatherAnalysis | Yes | |
| Common::CloudLayer | Yes | |
| Common::AerodromeCloudForecast | Yes | |
| Common::AerodromeSurfaceWindForecast | Common::AerodromeSurfaceWindTrendForecast | |
| Common::AerodromeSurfaceWindTrendForecast | Yes |
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