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>
    <allfileusages gafcontinue="BladeLigerCaesar00.jpg|24" />
  </query-continue>
  <query>
    <pages>
      <page pageid="12" ns="0" title="Berserk Fury (Zoid)" />
      <page pageid="13" ns="0" title="Berserk Fury (New Century Anime)" />
      <page pageid="14" ns="0" title="Berserk Fury (Chaotic Century Manga)" />
      <page pageid="98" ns="0" title="Zoids: The Battle Begins" />
      <page pageid="511" ns="0" title="Bashing" />
      <page pageid="574" ns="0" title="Bit Cloud (New Century Anime)" />
      <page pageid="968" ns="0" title="Bio Tyranno (Genesis)" />
      <page pageid="1801" ns="0" title="Return to Another Tomorrow" />
    </pages>
  </query>
</api>