/** Machine Learning Web Service - returns the unclassified Tweets to be classified */
  @WebMethod(operationName = "getAllUnclassifiedCountryTweets")
  public Vector<MachineLearningItem> getAllUnclassifiedCountryTweets()
      throws NamingException, SQLException {

    return DBMachineLearningOperations.getAllUnclassifiedCountryTweets();
  }