The complete DDS:

Dataset {

    Int32 i[20];

    Int32 j;

    String s;

    Grid {

      Array:

        Float64 val[length = 5][width = 6][height = 7];

      Maps:

        Float64 length[5];

        Float64 width[6];

        Float64 height[7];

    } g;

} test1;

The data:

Float64 j = 246913578;