procedure to obtain an xml attribute from webserver

xml.java

URL url = new URL("http://pastebin.com/raw.php?i=RF8cL5YZ");
InputSource origin = new InputSource(url.openStream());
XPath path = XPathFactory.newInstance().newXPath();
String exp = "/a/b/c";            
Node nodo = (Node) path.evaluate(exp, origin, XPathConstants.NODE);
NamedNodeMap attrs = nodo.getAttributes();            
String atrib = attrs.getNamedItem("id").getNodeValue();
System.out.println(atrib);