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="Area 2 easy cave.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="327" ns="6" title="File:108.JPG" />
      <page pageid="307" ns="6" title="File:Access topo.jpg" />
      <page pageid="137" ns="6" title="File:Angola boulder.jpg" />
      <page pageid="35" ns="6" title="File:Area7eastwall1.gif" />
      <page pageid="36" ns="6" title="File:Area7westwall1.gif" />
      <page pageid="309" ns="6" title="File:Area 1 p1.jpg" />
      <page pageid="310" ns="6" title="File:Area 1 p2.jpg" />
      <page pageid="311" ns="6" title="File:Area 1 p3.jpg" />
      <page pageid="312" ns="6" title="File:Area 1 p4.jpg" />
      <page pageid="313" ns="6" title="File:Area 1 p5.jpg" />
    </pages>
  </query>
</api>