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="BlueCrystal-UI1-DVD_Select_Menu.png|5385" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3487" ns="0" title="Bluetooth USB Adapter" />
      <page pageid="3913" ns="0" title="Network Setup" />
      <page pageid="3919" ns="2" title="User:Techstyle" />
      <page pageid="4066" ns="0" title="EP-636 SIP Phone" />
      <page pageid="4522" ns="0" title="Main Page with user videos" />
      <page pageid="4600" ns="0" title="Main Page old icons" />
      <page pageid="4676" ns="0" title="MetaData Handling" />
      <page pageid="5385" ns="0" title="Orbiter Skins BlueCrystal" />
    </pages>
  </query>
</api>