delete element from xml file

*I want to delete an element from xml-file. this is my code but the file
dosen't change when I test it.*

* *

* *

*public* *static* String supp(){

            *try*{

            *racine*=*document*.getRootElement();

            Element rac=*racine*.getChild("voitures");

               List   listelt = rac.getChildren();

                  *int* ok=1;

               Iterator i = listelt.iterator();

             *while*(i.hasNext()&& ok==1)

           {

               Element courrent = (Element)i.next();

               *if*
(courrent.getAttribute("immatricule").getValue().equals("8345
tU 125")){

                   System.*out*.println(" "+courrent.getAttribute(
"immatricule").getValue());

                     //Element free = (Element)courrent.detach();

                    System.*out*.println(rac.getName());



                    rac.removeContent(courrent);

                     ok=0;

                     //courrent.removeChild(couleur);

                     System.*out*.println("supprimé");

               }



           }}*catch*(Exception e){*return* e.getMessage();}

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