code: public Node getNodeByIdentifier(String identifier) throws ItemNotFoundException, RepositoryException
     {
        checkLive();
        Item item = dataManager.getItemByIdentifier(identifier, true);
        if (item != null && item.isNode())
        {
           return (Node)item;
        }
  
        throw new ItemNotFoundException("Node not found " + identifier + " at " + workspaceName);
     }
docs: {@inheritDoc}