try {
                     XMLInputFactory factory = XMLInputFactory.newInstance();
                     XMLEventReader eventReader =
                        factory.createXMLEventReader(
                           new FileReader("c:\test.xml"));
                     SAXBuilder saxBuilder = new SAXBuilder();
                     Document document = saxBuilder.build(new File("c:\test.xml"));
                     Element rootElement = document.getRootElement();
                     List<Element> documentsElements = rootElement.getChildren("DOCUMENT");
                     while(eventReader.hasNext()){
                        XMLEvent event = eventReader.nextEvent();
                        switch(event.getEventType()){
                           case XMLStreamConstants.START_ELEMENT:
                           StartElement startElement = event.asStartElement();
                           String qName = startElement.getName().getLocalPart();

                           if (qName.equalsIgnoreCase("DOCUMENTS")) {
                              Iterator<Attribute> attributes = startElement.getAttributes();

                                 for(int i=0;i < documentsElements.size();i++){
                                    Element docElement = documentsElements.get(i);
                                        docElement.removeChild("nbr");
                                        docElement.addContent(new Element("nbr").setText("80"));

                                }
                             }
                           break;
                        }
                     }
                     XMLOutputter xmlOutput = new XMLOutputter();
                     // display xml
                     xmlOutput.setFormat(Format.getPrettyFormat());
                     xmlOutput.output(document, System.out);
                  } catch (FileNotFoundException e) {
                     e.printStackTrace();
                  } catch (JDOMException e) {
                     e.printStackTrace();
                  } catch (IOException e) {
                     e.printStackTrace();
                  }