netcdf ref_tst_grp_spec0 {
dimensions:
	dim = UNLIMITED ; // (1 currently)
variables:
	float var(dim) ;
data:

 var = 0 ;

group: g1 {
  dimensions:
  	dim = 1 ;
  variables:
  	float var(dim) ;
  data:

   var = 1 ;

  group: g2 {
    dimensions:
    	dim = 2 ;
    variables:
    	float var(dim) ;
    data:

     var = 1, 2 ;
    } // group g2

  group: g3 {
    dimensions:
    	dim = 3 ;
    variables:
    	float var(dim) ;
    data:

     var = 1, 2, 3 ;
    } // group g3
  } // group g1

group: g4 {
  dimensions:
  	dim = 4 ;
  variables:
  	float var(dim) ;
  data:

   var = 1, 2, 3, 4 ;

  group: g5 {
    dimensions:
    	dim = 5 ;
    variables:
    	float var(dim) ;
    data:

     var = 1, 2, 3, 4, 5 ;

    group: g6 {
      dimensions:
      	dim = 6 ;
      variables:
      	float var(dim) ;
      data:

       var = 1, 2, 3, 4, 5, 6 ;
      } // group g6

    group: g1 {
      dimensions:
      	dim = 1 ;
      variables:
      	float var(dim) ;
      data:

       var = 451 ;
      } // group g1
    } // group g5
  } // group g4
}