code: public Batchlet<Step<T>> getOrCreateBatchlet()
     {
        Node node = childNode.getOrCreate("batchlet");
        Batchlet<Step<T>> batchlet = new BatchletImpl<Step<T>>(this, "batchlet", childNode, node);
        return batchlet;
     }
docs: If not already created, a new <code>batchlet</code> element with the given value will be created.
  Otherwise, the existing <code>batchlet</code> element will be returned.
  @return  a new or existing instance of <code>Batchlet<Step<T>></code>