private void write(String indent, Node node, Element element) {
   boolean childAdded = false;
   addText(indent, element);
   Element newElement = null;
   if (node instanceof AbstractNodeContainer) {
     newElement = addElement(element, "node-container");
   } else {
     newElement = addElement(element, "node");
   }
   addAttribute(newElement, "name", ((NamedElement) node.getSemanticElement()).getName());
   addAttribute(newElement, "x", String.valueOf(node.getConstraint().x));
   addAttribute(newElement, "y", String.valueOf(node.getConstraint().y));
   addAttribute(newElement, "width", String.valueOf(node.getConstraint().width));
   addAttribute(newElement, "height", String.valueOf(node.getConstraint().height));
   if (node instanceof AbstractNodeContainer) {
     Iterator nodes = ((AbstractNodeContainer) node).getNodes().iterator();
     while (nodes.hasNext()) {
       childAdded = true;
       write(indent + "  ", (Node) nodes.next(), newElement);
     }
   }
   Iterator edges = node.getLeavingEdges().iterator();
   while (edges.hasNext()) {
     childAdded = true;
     Edge edge = (Edge) edges.next();
     addText(indent + "  ", newElement);
     Element newEdge = addElement(newElement, "edge");
     write(indent + "  ", edge, newEdge);
   }
   if (childAdded) {
     addText(indent, newElement);
   }
 }
 private void addConstraint(Node node, Element nodeInfo) {
   Rectangle constraint = node.getConstraint().getCopy();
   Dimension initialDimension =
       NotationMapping.getInitialDimension(node.getSemanticElement().getElementId());
   if (initialDimension != null) {
     constraint.setSize(initialDimension);
   }
   if (nodeInfo != null) {
     constraint.x = Integer.valueOf(getAttribute(nodeInfo, "x")).intValue();
     constraint.y = Integer.valueOf(getAttribute(nodeInfo, "y")).intValue();
     constraint.width = Integer.valueOf(getAttribute(nodeInfo, "width")).intValue();
     constraint.height = Integer.valueOf(getAttribute(nodeInfo, "height")).intValue();
   }
   node.setConstraint(constraint);
 }