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="2453controlOut.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="23" ns="6" title="File:2226 photo.jpg" />
      <page pageid="26" ns="6" title="File:2255 photo.jpg" />
      <page pageid="43" ns="6" title="File:2410.jpg" />
      <page pageid="93" ns="6" title="File:2410TA photo.jpg" />
      <page pageid="84" ns="6" title="File:2410 telnet help.png" />
      <page pageid="118" ns="6" title="File:2426 photo.jpg" />
      <page pageid="59" ns="6" title="File:2453AdminNet.jpg" />
      <page pageid="57" ns="6" title="File:2453configA.jpg" />
      <page pageid="60" ns="6" title="File:2453configOut.png" />
      <page pageid="58" ns="6" title="File:2453controlA.jpg" />
    </pages>
  </query>
</api>