METAR/SPECI nillable observations

wmo-im / iwxxm

XML schema and Schematron for aviation weather data exchange

https://old.wmo.int/wiswiki/tiki-index.php%3Fpage=TT-AvXML

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METAR/SPECI nillable observations #86

Closed braeckel closed 6 years ago

braeckel commented 6 years ago

Closes #23. All observed phenomena on METAR/SPECI should now be nillable and should allow for nilReasons to be provided. Added new WithNilReason types: MeasureWithNilReason and VelocityWithNilReason.