_layerStack = new Stack();
_layerStack = new Stack<EditorLayer>();
    protected void parseXML(Reader in, EditorLayer layer) throws Exception {        _layer = layer;        _graphModel = (MutableGraphModel) _layer.getGraphModel();        _netNodeList = new Hashtable();        _graphModelStack = new Stack();        _graphModelStack.push(_graphModel);        _layerStack = new Stack();        _layerStack.push(_layer);        SAXParserFactory factory = SAXParserFactory.newInstance();        factory.setNamespaceAware(false);        factory.setValidating(false);        SAXParser pc = factory.newSAXParser();        InputSource is = new InputSource(in);        pc.parse(is, this);        in.close();    }