[jdom-interest] Exception when creating a document from arraylist

[X.P.Pratibha :-)]

Hi all,
       My problem is to edit an xml document to remove the duplicate 
entries it has before giving it to the XSL for display....
Here goes my logic:
 1)Get the document.
2) traverse it for duplicate entries and put all the unique entries into 
an array list
3) Then create the new document with elements in arraylist.
4)I am creating the root element and subroot element and adding the each 
element in my array list...Here I am getting the exception
"*element* *already* *has* an existing *parent FWRules" 
--IllegalADDException.* 
<http://www.jdom.org/pipermail/jdom-interest/2001-October/007851.html>

P.S :The elements in the list has elements which in turn has so many 
sub-elements...

Can u please help me what I am doing wrong ???How to convert  a list to 
Document again...I am using JDK1.3.1
        
                    Element Oldelem = 
doc.getRootElement().getChild("Success").getChild("Rules");       
               
                         ListIterator OldIter = 
Oldelem.getChild("FWRules").getChildren("ConRule").listIterator();
                         Vector ID_ref = new Vector();
                         ArrayList new_list = new ArrayList();
                         int count=0;
                         while(OldIter.hasNext())
                         {
                             Element OldChildElem=((Element) 
OldIter.next());
                             Element Attri = 
OldChildElem.getChild("FWRule");
                             String ID=Attri.getAttributeValue("id");   
                                                    
                             count++;
                             if(count<=1)
                             {                               
                                 ID_ref.addElement(ID);                 
              
                                 new_list.add(OldChildElem);  
                      

                             }
                             else if(!ID.equals(ID_ref.elementAt(0)))
                             {                               
                                 ID_ref.remove(0);
                                 ID_ref.addElement(ID);
                                 new_list.add(OldChildElem);           
                

                             }
                         }

                        Document Doc_New = new Document(new 
Element("Rules"));               
                        Element sub-elem =new Element("FWRules");      
                                                   
                        for(int l=0;l<new_list.size();l++)
                        {                      
                           Element element_In_list = 
((Element)new_list.get(l));
                           XMLOutputter output =new XMLOutputter();
                           
System.out.println("XMLOutputter:"+output.outputString(output));
                           *sub-elem.addContent(elment_In_list); //HERE 
IS where I get the exception*
                       }
                         Doc_New.getRootElement().addContent(subroot);

                     }
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