Dataset {
    Int32 gid[gid = 98];
    Grid {
     ARRAY:
        Int32 geom_id[gid = 98];
     MAPS:
        Int32 gid[gid = 98];
    } geom_id;
    Byte r_name[gid = 98][25];
    Byte system[gid = 98][16];
    Sequence { Sequence { Float64 ordinate; Float64 abscissa; } line; } the_geom[gid = 98];
} MajorRivers;