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="世界文學:出關" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="1" ns="0" title="Main Page" />
      <p pageid="1722" ns="0" title="Test a01" />
      <p pageid="1688" ns="0" title="UneedADV 專欄" />
      <p pageid="1734" ns="0" title="世界文學:2018臺灣運勢" />
      <p pageid="1759" ns="0" title="世界文學:2018臺灣選舉" />
      <p pageid="1742" ns="0" title="世界文學:佳節 慶祝" />
      <p pageid="1797" ns="0" title="世界文學:俠情" />
      <p pageid="1805" ns="0" title="世界文學:冬至" />
      <p pageid="1760" ns="0" title="世界文學:冬返" />
      <p pageid="1740" ns="0" title="世界文學:冬願.迴文詩" />
    </allpages>
  </query>
</api>