docs: def main (args):
    """Usage: echo_sedml input-filename output-filename
    """
    if len(args) != 3:
      print(main.__doc__)
      sys.exit(1)
  
    d = libsedml.readSedML(args[1]);
    if ( d.getErrorLog().getNumFailsWithSeverity(libsedml.LIBSEDML_SEV_ERROR) > 0):
      print (d.getErrorLog().toString());
    else:
      libsedml.writeSedML(d, args[2]);
  
    return 0;