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="Map_example1.png" />
  </query-continue>
  <query>
    <pages>
      <page ns="6" title="File:Aliens Angels, Aliens Gods, Gods, God.jpg" missing="" />
      <page pageid="11" ns="6" title="File:Castor wheel.jpeg" />
      <page pageid="17" ns="6" title="File:Dashed-line-setting.png" />
      <page pageid="15" ns="6" title="File:Example-image-details.png" />
      <page pageid="24" ns="6" title="File:Flightcase.jpg" />
      <page pageid="19" ns="6" title="File:Form-ply-Example.jpg" />
      <page pageid="12" ns="6" title="File:Hex screw.jpeg" />
      <page pageid="18" ns="6" title="File:Label-text-settings.png" />
      <page pageid="8" ns="6" title="File:Letter style.jpeg" />
      <page pageid="23" ns="6" title="File:Logging dhcp.png" />
    </pages>
  </query>
</api>