Dataset {
    Int32 gid[gid = 10];
    Grid {
     ARRAY:
        Int32 count[gid = 10];
     MAPS:
        Int32 gid[gid = 10];
    } count;
    Grid {
     ARRAY:
        Int32 geom_id[gid = 10];
     MAPS:
        Int32 gid[gid = 10];
    } geom_id;
    Byte grp[gid = 10][3];
    Sequence { Sequence { Sequence { Float64 ordinate; Float64 abscissa; } ring; } polygon; } the_geom[gid = 10];
} Regions;