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>
    <allimages gaicontinue="2012-03-13_Pi_Day_Eve_2.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1829" ns="6" title="File:05-31-07 notes.jpg" />
      <page pageid="1692" ns="6" title="File:100 1466.JPG" />
      <page pageid="1693" ns="6" title="File:100 1478.JPG" />
      <page pageid="1694" ns="6" title="File:100 1479.JPG" />
      <page pageid="1695" ns="6" title="File:100 1488.JPG" />
      <page pageid="1696" ns="6" title="File:100 1490.JPG" />
      <page pageid="1697" ns="6" title="File:100 1493.JPG" />
      <page pageid="2938" ns="6" title="File:110503 2011 Foundry Plan.doc.pdf" />
      <page pageid="3213" ns="6" title="File:2004FRCRobotController.jpg" />
      <page pageid="3251" ns="6" title="File:2012-03-13 Pi Day Eve 1.jpg" />
    </pages>
  </query>
</api>