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>
    <allredirects>
      <r ns="0" title="Disable Windows Firewall from Commandline" />
      <r ns="0" title="Logon/Startup Scripts" />
      <r ns="0" title="NIC Bonding on XenServer" />
      <r ns="0" title="Renew Expired Security Certificate (Exchange 2007)" />
      <r ns="0" title="RickRoll" />
      <r ns="0" title="Software Deployment with Group Policy" />
    </allredirects>
  </query>
</api>