HDF5 "h5_regref.h5" {
GROUP "/" {
   DATASET "MATRIX" {
      DATATYPE  H5T_STD_I32LE
      DATASPACE  SIMPLE { ( 2, 9 ) / ( 2, 9 ) }
   }
   DATASET "REGION_REFERENCES" {
      DATATYPE  H5T_REFERENCE
      DATASPACE  SIMPLE { ( 2 ) / ( 2 ) }
   }
}
}