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="Flashing_with_Phoenix_03.jpg|3349" />
  </query-continue>
  <query>
    <pages>
      <page pageid="11" ns="0" title="Nokia E51 pinout" />
      <page pageid="1074" ns="0" title="Sonyericsson DB2020 CID53 unlock using setool2" />
      <page pageid="1122" ns="0" title="Nokia BP-6M battery" />
      <page pageid="3349" ns="0" title="Nokia firmware update with Phoenix Service Software" />
      <page pageid="3352" ns="0" title="Nokia language change with Phoenix Service Software" />
      <page pageid="5010" ns="0" title="Nokia BV-5JW battery" />
      <page pageid="5012" ns="0" title="Nokia BP-3L battery" />
      <page pageid="5018" ns="0" title="Nokia BP-5Z battery" />
    </pages>
  </query>
</api>