netcdf tst_ncml {
dimensions:
   m = 2;
   t = unlimited;
variables:
   float var (t, m);
     var:tatt = "text attribute value" ;
     var:natt = 1, 2;
     var:datt = 7.02788826649782e-09, -7.02788826649782e-09 ;
   :gtatt = "<, >, \', \", and &" ;
   :gnatt = 3, 4;
   :gdatt = -7.02788826649782e-09, 7.02788826649782e-09 ;
   char :gnul = "\000abcd\000\000hello\000" ;
}