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="Bald_Eagle.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="240" ns="6" title="File:2 or more accessories.png" />
      <page pageid="82" ns="6" title="File:Acorn Building 500.png" />
      <page pageid="85" ns="6" title="File:Acorn sock 500.png" />
      <page pageid="79" ns="6" title="File:Acorn sugarcube.png" />
      <page pageid="80" ns="6" title="File:Acorn sugarcube 400.png" />
      <page pageid="247" ns="6" title="File:Animal headbands.png" />
      <page pageid="358" ns="6" title="File:Antlers horns.png" />
      <page pageid="359" ns="6" title="File:Armor Plated.png" />
      <page pageid="342" ns="6" title="File:Arrow nose.png" />
      <page pageid="318" ns="6" title="File:Bad Apple MYO.jpg" />
    </pages>
  </query>
</api>