saveDocument();
saveDocument(projectXML);
	public boolean addProject(String projectName, User user, String description)	{		XPath xpath = XPathFactory.newInstance().newXPath();		String expression = "//*";				UsersParser userP = UsersParser.getInstance();				if(!userP.isUser(user.getLogin()))		{			return false;		}		else		{			Element elem = null;			Element newElem = doc.createElement("project");						try {				elem = (Element)xpath.evaluate(expression, this.doc, XPathConstants.NODE);			}			catch (XPathExpressionException e) {								e.printStackTrace();			}			if ( elem != null ) {				newElem.setAttribute(ATTR_NAME, projectName);				newElem.setAttribute(ATTR_DESC, description);							elem.appendChild(newElem);				addUser(projectName, user, true, false, false, false);				saveDocument();				return true;			}			else {				System.out.println("Ajout de l'utilisateur "+user.getLogin()+" impossible!");				return false;			}		}	}