public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        if (qName.equals("voyageur")) {

            if (currentVoyageur != null) {
                throw new IllegalStateException("already processing a voyageur");
            }
            currentVoyageur = new voyageur();
        } else if (qName.equals("id_voyageur")) {
            idTag = "open";
        } else if (qName.equals("nom")) {
            nomTag = "open";
        } else if (qName.equals("prenom")) {
            prenomTag = "open";
        }else if (qName.equals("e_mail")) {
            emailTag = "open";
        }
        else if (qName.equals("password")) {
            passwordTag = "open";
        }
        else if (qName.equals("date_inscription")) {
            date_inscriptionTag = "open";
        }
    }