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 alcontinue="etcd" />
  </query-continue>
  <query>
    <alllinks>
      <l ns="0" title="CoreOS" />
      <l ns="0" title="CoreOS Container LinuxをVMwareで動かす" />
      <l ns="0" title="Docker" />
      <l ns="0" title="Eclipse Che" />
      <l ns="0" title="GNU parallel" />
      <l ns="0" title="LinuxKit" />
      <l ns="0" title="Moby" />
      <l ns="0" title="NewArticle" />
      <l ns="0" title="PhantomJSのQXcbConnection Could not connect to displayを解決する方法" />
      <l ns="0" title="curlでリダイレクトの遷移を追う方法" />
    </alllinks>
  </query>
</api>