function node(node) {
  return safe(node.id) + " [label=<" + node.name + "<br/><font color=\"#404040\" point-size=\"5\">" + node.kind + (node.version ? ("[" + node.version + "]") : "") + "</font><br/><font color=\"#404040\" point-size=\"5\">" + node.id + "</font>>]";
}