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>
    <alllinks galcontinue="Javaで10進数を2進数と8進数と16進数に変換する方法|14" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3" ns="0" title="メインページ" />
      <page pageid="7" ns="0" title="コレクションフレームワーク" />
      <page pageid="22" ns="0" title="スレッド" />
    </pages>
  </query>
</api>