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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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Schematron rule METAR_SPECI.MATFR5 became redundant from IWXXM 2.1 #65

Closed blchoy closed 6 years ago

blchoy commented 6 years ago

Starting from IWXXM 2.1, trendForecast should be nil when no significant changes are forecast (see http://schemas.wmo.int/iwxxm/2.1.1RC1/examples/TAC-to-XML-Guidance.txt):

NOSIG - No significant changes are forecast When no change is expected to occur, this shall be indicated by a single nil "trendForecast" with a nil reason of "http://codes.wmo.int/common/nil/noSignificantChange"

This makes schematron rule METAR_SPECI.MATFR5 redundant as the attribute changeIndicator to MeteorologicalAerodromeTrendForecastRecord will never have a value of "NO_SIGNIFICANT_CHANGES".

This should be removed in subsequent publications, notably 3.0.0RC1.