var json2 =({
  "?xml": {
    "@version": "1.0",
    "@encoding": "UTF-8"
  },
  "text": {
    "heading1": {
      "@fieldnumber": "0",
      "#text": "目的"
    },
    "objective": {
      "@fieldnumber": "1",
      "#text": "学习心脏的基本结构。"
    },
    "heading2": {
      "@fieldnumber": "2",
      "#text": "总结"
    },
    "summary": {
      "@fieldnumber": "3",
      "#cdata-section": "&#187;  心脏有四个腔。\n<br>&#187;  上面的腔叫做心房，下面的腔叫做心室。\n<br>&#187;  瓣膜保证血液在心脏中只沿着一个方向流动。\n<br>&#187;  冠状动脉为心肌提供血液。\n<br>&#187;  如果这些血管堵塞的话，心肌细胞就可能因为得不到充足的营养和氧气而停止工作。\n<br>&#187;  这就是心脏病。"
    }
  }
});
