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="教育自造者計畫期程.png|293" />
  </query-continue>
  <query>
    <pages>
      <page pageid="25" ns="0" title="國民教育基本需求試算研究案/期末報告" />
      <page pageid="55" ns="0" title="維基教科書" />
      <page pageid="61" ns="0" title="網路兩端的機器" />
      <page pageid="84" ns="3" title="使用者討論:丁志仁" />
      <page pageid="92" ns="1" title="討論:教育基本需求國小人力試算" />
      <page pageid="100" ns="0" title="Wordpress/外掛" />
      <page pageid="169" ns="0" title="教育再公共化聯盟/實習/新手課表" />
      <page pageid="653" ns="0" title="自主學習帶領者培力/基本技能培力工作圈" />
    </pages>
  </query>
</api>