You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaifrom="Baskets 3-31-2007 009.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="155" ns="6" title="File:12345.JPG" />
      <page pageid="98" ns="6" title="File:Background.jpg" />
      <page pageid="179" ns="6" title="File:Baskets 3-31-2007 001.jpg" />
      <page pageid="180" ns="6" title="File:Baskets 3-31-2007 002.jpg" />
      <page pageid="181" ns="6" title="File:Baskets 3-31-2007 003.jpg" />
      <page pageid="182" ns="6" title="File:Baskets 3-31-2007 004.jpg" />
      <page pageid="183" ns="6" title="File:Baskets 3-31-2007 005.jpg" />
      <page pageid="184" ns="6" title="File:Baskets 3-31-2007 006.jpg" />
      <page pageid="185" ns="6" title="File:Baskets 3-31-2007 007.jpg" />
      <page pageid="186" ns="6" title="File:Baskets 3-31-2007 008.jpg" />
    </pages>
  </query>
</api>