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>
    <pages>
      <page pageid="578" ns="6" title="File:Device License Ico.png" contentmodel="wikitext" pagelanguage="en" touched="2013-06-19T08:14:24Z" lastrevid="1499" counter="887" length="0" new="" />
      <page pageid="506" ns="6" title="File:Driver native.png" contentmodel="wikitext" pagelanguage="en" touched="2013-04-25T08:08:34Z" lastrevid="1307" counter="1897" length="0" new="" />
      <page pageid="480" ns="6" title="File:Driver script.png" contentmodel="wikitext" pagelanguage="en" touched="2013-04-25T08:12:52Z" lastrevid="1279" counter="2045" length="0" new="" />
      <page pageid="979" ns="6" title="File:IRidiumLogo blue.png" contentmodel="wikitext" pagelanguage="en" touched="2013-08-21T09:00:57Z" lastrevid="2764" counter="15" length="0" new="" />
      <page pageid="577" ns="6" title="File:Site License Ico.png" contentmodel="wikitext" pagelanguage="en" touched="2013-06-19T08:14:24Z" lastrevid="1498" counter="864" length="0" new="" />
    </pages>
  </query>
</api>