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>
    <allfileusages gafcontinue="Properties.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="94" ns="6" title="File:Ceoscreenshot.png" />
      <page pageid="22" ns="6" title="File:Feature-graphic.jpg" />
      <page pageid="100" ns="6" title="File:Garbage Man.jpg" />
      <page pageid="58" ns="6" title="File:IOT ACHI.jpg" />
      <page pageid="59" ns="6" title="File:IOT CEOS.jpg" />
      <page pageid="61" ns="6" title="File:IOT RETI.jpg" />
      <page pageid="70" ns="6" title="File:IOT SETI.jpg" />
      <page pageid="69" ns="6" title="File:IOT SPEC.jpg" />
      <page pageid="63" ns="6" title="File:IOT STAT.jpg" />
      <page pageid="64" ns="6" title="File:IOT TECH.jpg" />
    </pages>
  </query>
</api>