code: public static void main( String[] args ) throws Exception
    {
      System.out.println("SBOL 1 example");
      write(new OutputStreamWriter(System.out), DataTreeCreator.makeDocument());
  
      System.out.println();
      System.out.println("----------------------------------------");
      System.out.println();
  
      System.out.println("SBOL 2 example");
      write(new OutputStreamWriter(System.out), DataTreeCreator.makeSBOL2Document());
    }
docs: Exports two example DocumentRoot objects (SBOL 1.1.0 and SBOL 2.0 objects) in the GraphViz format.
  
  @param args  command-line argument
  @throws Exception if anything goes wrong