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>
    <alltransclusions gatcontinue="Warning|10" />
  </query-continue>
  <query>
    <pages>
      <page pageid="15" ns="0" title="修復檔使用需知" />
      <page pageid="16" ns="0" title="在視窗系統下利用par2修復檔來修復檔案" />
      <page pageid="14" ns="0" title="壞檔的製作方式" />
      <page pageid="27" ns="0" title="射手網字幕總匯" />
      <page pageid="20" ns="0" title="常見問答" />
      <page pageid="17" ns="0" title="樹狀圖與映射文件的使用方式" />
      <page pageid="4" ns="0" title="檔案下載需知" />
      <page pageid="18" ns="0" title="進階腳本的工作原理與生成檔案說明" />
      <page pageid="1" ns="0" title="首頁" />
    </pages>
  </query>
</api>