saveDocument();
saveDocument(projectXML);
	public void removeUser(String projectName, String login)	{		XPath xpath = XPathFactory.newInstance().newXPath();		String expression = "//project[@name='"+projectName+"']";		String expr = "//project[@name='"+projectName+"']/user[@login='"+login+"']";		UsersParser user = UsersParser.getInstance();				if(!user.isUser(login))		{			System.out.println("L'utilisateur "+login+" n'existe pas!");		}		else		{			Element elem = null;			Element oldElem = null;						try {				elem = (Element)xpath.evaluate(expression, this.doc, XPathConstants.NODE);				oldElem = (Element)xpath.evaluate(expr, this.doc, XPathConstants.NODE);			}			catch (XPathExpressionException e) {								e.printStackTrace();			}			if ( elem != null ) {				elem.removeChild(oldElem);				saveDocument();				System.out.println("Suppression de l'utilisateur "+login+" effectuee!"); 			}			else {				System.out.println("Suppression de l'utilisateur "+login+" impossible!"); 			}		}					}