• More primitive types (e.g. unsigned int)
• Structure - set of related variables (like in C/C++)
• Sequence - sequence of "structure-like" instances; # of instances is not predefined (somewhat similar to UNLIMITED)
• Grids are similar to netcdf-3 coordinate variables in that they combine an array with its coordinate variable arrays

Dataset {
 Sequence {
  Structure {
   Float64 windW[10]; Float64 windN[10]; String name;
  } station;
  Grid {
   ARRAY: Float64 fluor[10][10][10];
   MAPS: Float64 lat[10]; Float64 lon[10]; Float64 depth[10];
  } profile;
  Float32 sst;
  Float32 light;
 } CS02;
} ComplexSequence02;

2008 Unidata NetCDF Workshop for Developers and Data Providers > Remote Access to Datasets Through netCDF-3