var json2 =({
  "?xml": {
    "@version": "1.0",
    "@encoding": "UTF-8"
  },
  "text": {
    "heading1": {
      "@fieldnumber": "0",
      "#text": "目的"
    },
    "objective": {
      "@fieldnumber": "1",
      "#text": "学习用勾股定理解题。"
    },
    "heading2": {
      "@fieldnumber": "2",
      "#text": "总结"
    },
    "summary": {
      "@fieldnumber": "3",
      "#cdata-section": "&#187;  勾股定理可以应用于所有直角三角形。\n<br>&#187;  定理指出在一个直角三角形内，斜边标记为c，则c² = a² + b²。\n<br>&#187;  该定理具有可逆性。即如果一个三角形符合勾股定理的逆定理，它一定是直角三角形。"
    }
  }
});
