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private boolean doLogin(String userName, String pwd)
  throws ParserConfigurationException, SAXException, IOException, XPathExpressionException {

  DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
  domFactory.setNamespaceAware(true);
  DocumentBuilder builder = domFactory.newDocumentBuilder();
  Document doc = builder.parse("users.xml");

  XQuery xquery = new XQueryFactory().createXQuery(new File("login.xryxq"));
  Map queryVars = new HashMap();
  queryVars.put("userName", userName);
  queryVars.put("password", pwd);
  NodeList nodes = xquery.execute(doc, null, queryVars).toNodes();

  // Print first names to the console
  for (int i = 0; i < nodes.getLength(); i++) {
    Node node = nodes.item(i).getChildNodes().item(1).getChildNodes().item(0);
    System.out.println( node.getNodeValue());
  }

  return (nodes.getLength() >= 1);
}