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="3dconnection003.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1007" ns="6" title="File:1208 CAP-XX - Charging a Supercapacitor from a Solar Cell.pdf" />
      <page pageid="1008" ns="6" title="File:156604.pdf" />
      <page pageid="1573" ns="6" title="File:23k256.PNG" />
      <page pageid="1574" ns="6" title="File:23k256 instructions.PNG" />
      <page pageid="1575" ns="6" title="File:23k256 status.PNG" />
      <page pageid="1576" ns="6" title="File:23k256 status write.PNG" />
      <page pageid="1009" ns="6" title="File:3d-suppliers-1.JPG" />
      <page pageid="1010" ns="6" title="File:3dconnection-1.jpg" />
      <page pageid="1812" ns="6" title="File:3dconnection001.jpg" />
      <page pageid="1813" ns="6" title="File:3dconnection002.jpg" />
    </pages>
  </query>
</api>