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="20P.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="88" ns="6" title="File:01 initial setup.png" />
      <page pageid="89" ns="6" title="File:02 device type settings.png" />
      <page pageid="90" ns="6" title="File:03 local device settings.png" />
      <page pageid="91" ns="6" title="File:04 ser2sock configuration.png" />
      <page pageid="92" ns="6" title="File:05 network device settings.png" />
      <page pageid="93" ns="6" title="File:06 alarmdecoder settings.png" />
      <page pageid="94" ns="6" title="File:07 device testing.png" />
      <page pageid="95" ns="6" title="File:08 create initial account.png" />
      <page pageid="7" ns="6" title="File:10se.jpg" />
      <page pageid="11" ns="6" title="File:128BP.jpg" />
    </pages>
  </query>
</api>