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>
    <pages>
      <page pageid="67" ns="6" title="File:Engineer aug.png" />
      <page pageid="66" ns="6" title="File:Engineer rank.png" />
      <page pageid="79" ns="6" title="File:Engineer repair.png" />
      <page pageid="8" ns="6" title="File:Ron logo small.png" />
      <page pageid="7" ns="6" title="File:Tib 72 4278190082.jpg" />
      <page pageid="11" ns="6" title="File:Tutorials.png" />
    </pages>
  </query>
</api>