edge { arrowstyle: filled; }
graph {
  colorscheme: x11;
  flow: south;
  title: G;
  x-dot-overlap: false;
  x-dot-ratio: fill;
  x-dot-size: 11,8.5;
}

[ 123 ] { fontsize: 10px; shape: none; }
[ foo ] { fontsize: 10px; shape: none; }

[ 123 ] --> [ foo ]