Dataset {
    String district[district = 940];
    Float32 BaseYears[BaseYears = 29];
    Grid {
     ARRAY:
        Float64 partial_district[district = 940][BaseYears = 29];
     MAPS:
        String district[district = 940];
        Float32 BaseYears[BaseYears = 29];
    } partial_district;
} partial_district;