var json2 =({
  "?xml": {
    "@version": "1.0",
    "@encoding": "UTF-8"
  },
  "text": {
    "heading1": {
      "@fieldnumber": "0",
      "#text": "目的"
    },
    "objective": {
      "@fieldnumber": "1",
      "#text": "理解如何在平面直角坐标系上描述坐标点。"
    },
    "heading2": {
      "@fieldnumber": "2",
      "#text": "总结"
    },
    "summary": {
      "@fieldnumber": "3",
      "#cdata-section": "&#187;  这个平面被一条称为x轴的水平线分割。\n<br>&#187;  在x轴上标注正数、负数，0在中心。\n<br>&#187;  这个平面同样被一条称为y轴的铅直线分割，数字的标注方式与x轴一样。\n<br>&#187;  坐标系首先画x轴，然后画y轴。\n<br>&#187;  x轴、y轴将这个平面分成四部分，叫做象限。"
    }
  }
});
