Adding new element block before the original nodes

Question

I want to form a new xml like this:
<xml>
<form id="name1"> // this is
</form> // new element i'll add
<form id="_name1"> // this is
</form> // original element
<form id="name2"> // this is
</form> // new element i'll add
<form id="_name2"> // this is
</form> // original element
</xml>
how to insert new element parts into xml file by using Jdom?
Thanks
jj

Answer 1

Sorry for my format
I added i.previous();
                                        i.add(newFormElement);
                                        i.next();still not work properly.
How can i do?? pls see my code again!
     public void modifyvxml(Document doc){
               Element root = doc.getRootElement();
               java.util.List forms = root.getChildren();
               if(forms.size()>0)
                    for(int formloop=0; formloop < forms.size() ; formloop++)
                         List newFormList = new java.util.LinkedList();
                         Element form = (Element)forms.get(forms.size());     
                         String form_id = form.getAttributeValue("id");
                         System.out.print ("Form_id is  "+form_id+"\n");
               ListIterator i = forms.listIterator();
               while (i.hasNext()) {
                    Element form = (Element) i.next();
                         String form_id = form.getAttributeValue("id");
                         if(form_id != null){          
                                        int j = 0;                    
                                        StringBuffer sb_form = new StringBuffer(form_id);
                                        sb_form.insert(0, '_');
                                        form_id = sb_form.toString();
                                        form.setAttribute("id", form_id);
//==================add new forms                         
                                        Element newFormElement = new Element("form");
                                        Element subdialog = new Element("subdialog");
                                        int index = forms.indexOf(newFormElement);
                                        newFormElement.setAttribute("id", form_id);                                        
                                        newFormElement.addContent(subdialog);
                                        subdialog.setAttribute("src", "call.jsp");
                                        i.previous();
                                        i.add(newFormElement);
                                        i.next();
//                                        newFormList.add(formloop,newFormElement);
//                                        newFormList.add(formloop,forms);
                    System.out.print ("new form_id is "+form_id+"\n");
//=====================
                    try{               
                    XMLOutputter out = new XMLOutputter();
                    File myXML = new File("testvxml.xml");
                    out.output(doc,new FileOutputStream(myXML));                                   
                    }catch (IOException e) {
                    e.getMessage();
}Thanks