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"?>
    <allfileusages gafcontinue="Browser_war3.jpg|113" />
      <page pageid="12" ns="0" title="Placa mare" />
      <page pageid="73" ns="0" title="Equips alternatius" />
      <page pageid="114" ns="0" title="WWW History" />
      <page pageid="234" ns="0" title="Connexions Bluetooth" />
      <page pageid="248" ns="0" title="CSS box model" />
      <page pageid="494" ns="0" title="Batalla naval en PHP" />