You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allfileusages gafcontinue="一分两率雷达图.png|178" />
  </query-continue>
  <query>
    <pages>
      <page pageid="172" ns="0" title="Open API" />
      <page pageid="199" ns="0" title="下载分析结果" />
      <page pageid="446" ns="0" title="统考版小题分的热力图合计计算" />
      <page pageid="451" ns="0" title="怎样添加一个填表入口" />
      <page pageid="465" ns="0" title="相关系数" />
      <page pageid="467" ns="0" title="小题答案格式" />
      <page pageid="469" ns="0" title="成绩云接口开发文档" />
    </pages>
  </query>
</api>