Dataset {
    Int32 id[id = 31];
    Byte first_name[id = 31][10];
    Grid {
     ARRAY:
        Int32 newfield1[id = 31];
     MAPS:
        Int32 id[id = 31];
    } newfield1;
    Sequence { Sequence { Sequence { Float64 ordinate; Float64 abscissa; } ring; } polygon; } the_geom[id = 31];
} Districts;