哪位高手能帮忙看下dom4j添加复杂节点--紧急
问题描述：
节点类似于：请帮忙看下！！！！我试过一些，在网上也找过找不到答案。。。
<?xml version="1.0" encoding="UTF-8"?>
2011-3-22,3.5
2011-3-22,2.0
2011-3-22,3.5
2011-3-22,2.0
答
Document doc = DocumentHelper.createDocument();
Element root = doc.addElement("report").addAttribute("type", "0");
Element chart = root.addElement("chart").addAttribute("id", "chartId");
Element data_collection1 = chart.addElement("data_collection").addAttribute("id", "collectionId1");
data_collection1.addElement("data").addText("2011-3-22,3.5");
data_collection1.addElement("data").addText("2011-3-22,2.0");
Element data_collection2 = chart.addElement("data_collection").addAttribute("id", "collectionId2");
data_collection2.addElement("data").addText("2011-3-22,3.5");
data_collection2.addElement("data").addText("2011-3-22,2.0");
System.out.println(doc.asXML());