var json2 =({
  "?xml": {
    "@version": "1.0",
    "@encoding": "UTF-8"
  },
  "text": {
    "heading1": {
      "@fieldnumber": "0",
      "#text": "目的"
    },
    "objective": {
      "@fieldnumber": "1",
      "#text": "学习如何用圆规和直尺平分线段。"
    },
    "heading2": {
      "@fieldnumber": "2",
      "#text": "总结"
    },
    "summary": {
      "@fieldnumber": "3",
      "#cdata-section": "&#187; 平分线段步骤：\n<br>&#187;  把圆规的半径定位在大于要被平分的线段长度的二分之一的某处。\n<br>&#187;  把圆规的尖点放于线段一端点然后在线段上下分别画弧。\n<br>&#187;  不改变圆规半径，将其尖点放在另一端点，同样在线段上下画弧。\n<br>&#187;  连接这些弧的交点。这条直线则穿过线段的中心。"
    }
  }
});
