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>
    <allpages apcontinue="Dopdf-文件轉PDF" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="8497" ns="0" title="Best Video Downloader-youtube影片下載功能嵌入" />
      <p pageid="11847" ns="0" title="Bird老師的國語科教學模式" />
      <p pageid="11846" ns="0" title="Bird老師的教育想法" />
      <p pageid="11848" ns="0" title="Bird老師的輔導活動教學模式" />
      <p pageid="11849" ns="0" title="Bird老師的道德健康教學模式" />
      <p pageid="11850" ns="0" title="Bird老師的體育科教學模式" />
      <p pageid="12142" ns="0" title="Centos-LAMP安裝" />
      <p pageid="12145" ns="0" title="Centos lamp指令" />
      <p pageid="8010" ns="0" title="Docx轉Doc" />
      <p pageid="6639" ns="0" title="Dopdf" />
    </allpages>
  </query>
</api>