Example 3 as CDL file

[nmassey001]

netcdf {

  // Example 3
  // An aggregated data variable whose aggregated data comprises two fragments.
  // Each fragment is stored in the same dataset and spans half of the aggregated
  // time dimension and the whole of the latitude and longitude dimensions, but
  // does not span the size 1 level dimension. As there are no external files,
  // the file variable contains only missing values, and therefore the format
  // variable may also be a scalar missing value. The fragments and aggregation
  // definition variables in this case are stored in a child group called
  // aggregation. The temp2 fragment has different but equivalent units to the
  // aggregation variable.

  dimensions:
    // Aggregated dimensions
    time = 12 ;
    level = 1 ;
    latitude = 73 ;
    longitude = 144 ;
   variables:
    // Data variable
    double temp ;
      temp:standard_name = "air_temperature" ;
      temp:units = "K" ;
      temp:cell_methods = "time: mean" ;
      temp:aggregated_dimensions = "time level latitude longitude" ;
      temp:aggregated_data = "location: /aggregation/location
                              file: /aggregation/file
                              format: /aggregation/format
                              address: /aggregation/address" ;
    // Coordinate variables
    double time(time) ;
      time:standard_name = "time" ;
      time:units = "days since 2001-01-01" ;
    double level(level) ;
      level:standard_name = "height_above_mean_sea_level" ;
      level:units = "m" ;
    double latitude(latitude) ;
      latitude:standard_name = "latitude" ;
      latitude:units = "degrees_north" ;
    double longitude(longitude) ;
      longitude:standard_name = "longitude" ;
      longitude:units = "degrees_east" ;

  // global attributes:
    :Conventions = "CF-1.9 CFA-0.6" ;
  data:
    temp = _ ;
    time = 0.0, 31.0, 59.0, 90.0, 120.0, 151.0, 181.0, 212.0, 243.0, 273.0, 304.0, 334.0 ;

  group: aggregation {
    dimensions:
      // Fragment dimensions
      f_time = 2 ;
      f_level = 1 ;
      f_latitude = 1 ;
      f_longitude = 1 ;
      // Extra dimensions
      i = 4 ;
      j = 2 ;
    variables:
      // Aggregation definition variables
      int location(i, j) ;
      string file(f_time, f_level, f_latitude, f_longitude) ;
      string format ;
      string address(f_time, f_level, f_latitude, f_longitude) ;
      // Fragment variables
      double temp1(time, latitude, longitude) ;
        temp1:units = "Kelvin" ;
      double temp2(time, latitude, longitude) ;
        temp2:units = "degreesC" ;

    data:
      location = 6, 6,
                 1, _,
                 73, _,
                 144, _ ;
     file = _, _ ;
     format = _ ;
     address = "temp1", "temp2" ;
     temp1 = 270.3, 272.5, 274.1, 278.5, 280.3, 283.6, _ ;
     temp2 = 4.5, 3.0, 0.0, -2.6, -5.6, -10.2, _ ;
  }
}