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1.0 Release Candidate 2 - May 2013
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- MetBasic removed from the WMO logical model structure. Met-Basic was intended to ensure that the semantics 
    defined in the WMO code-tables was applied within Application Schemas using METCE; this _was_ achieved 
    through provision of a palette of reusable “quantity value” and «CodeList» classes. However, in hindsight, 
    this resulted in coupling the model directly to the WMO code-tables and was a poor design choice that 
    introduced unnecessary redundancy and inhibiting the flexibility of the model with respect to changes 
    in the WMO code-tables.
    
    The functionality of the now defunct MetBasic model is now delivered as follows:
    (a) Within Application Schema (e.g. IWXXM) each quantity value property (e.g. "dewPointTemperature") will
    be specified as type "Measure" (from ISO 19103 Basic-types) - or a standard sub-type of "Measure" (e.g. 
    "Length") as defined in ISO 19103 Basic-types). Furthermore, each quantity value property will be
    annotated with a tagged value "quantity" that refers to the semantic definition of the quantity within
    the WMO codes registry[1] (e.g. for dewPointTemperature "quantity" = 
    "http://codes.wmo.int/common/c-15/me/dewPointTemperature"). It is this reference to an authoritative 
    definition that ensures consistent use of semantics.
    (b) «CodeList» classes (e.g. "RunwayDeposits") are defined directly within Application Schema (e.g. IWXXM) 
    for each nominal value property (e.g. "depositType", of type «CodeList» "RunwayDeposits"). The «CodeList» 
    classes are annotated with tagged values "vocabulary" (to refer to the appropriate code-table from the WMO 
    codes registry) and "extensibility" (to assert the validation regime to be used) as used in 1.0 Release 
    Candidate 1 within MetBasic (e.g. for RunwayDeposits "vocabulary" = 
    "http://codes.wmo.int/bufr4/codeflag/0-20-086" and "extensibility" = "none"). 
    
    As a result, all «CodeList» classes from MetBasic are now migrated to IWXXM. 
    
    Additionally note that, Class “«enumeration» RunwayVisualRangeTendency” (from Package “«Leaf» 
    PhysicalAtmosphericProperties - Aeronautical” is also migrated to IWXXM Package "«Leaf» METAR/SPECI" 
    where it is now named “«enumeration» VisualRangeTendency”.
    
    [1] note that for 1.0 Release Candidate 2 the WMO codes registry is deployed at http://test.wmocodes.info
    rather than the eventual target location of http://codes.wmo.int

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1.0 Release Candidate 1 - December 2012
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Initial model release.