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="Bimbisara" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Babylon" missing="" />
      <page ns="0" title="Babylonia" missing="" />
      <page ns="0" title="Babylonian Empire" missing="" />
      <page ns="0" title="Battle of Adrianople" missing="" />
      <page ns="0" title="Battle of Gaugamela" missing="" />
      <page ns="0" title="Battle of Marathon" missing="" />
      <page ns="0" title="Battle of Salamis" missing="" />
      <page ns="0" title="Battle of Zama" missing="" />
      <page ns="0" title="Battle of the Hydaspes River" missing="" />
      <page ns="0" title="Battle of the Teutoburg Forest" missing="" />
    </pages>
  </query>
</api>