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>
    <allimages>
      <img name="Traveliving.jpg" timestamp="2017-07-13T22:30:38Z" user="Dan" url="http://wikioverland.org/images/6/6a/Traveliving.jpg" descriptionurl="http://wikioverland.org/File:Traveliving.jpg" ns="6" title="File:Traveliving.jpg" />
      <img name="Traveliving_-_a_romantic_&amp;_practical_guide.jpg" timestamp="2017-07-06T19:36:48Z" user="Nikos Dimitriou" url="http://wikioverland.org/images/2/24/Traveliving_-_a_romantic_%26_practical_guide.jpg" descriptionurl="http://wikioverland.org/File:Traveliving_-_a_romantic_%26_practical_guide.jpg" ns="6" title="File:Traveliving - a romantic &amp; practical guide.jpg" />
      <img name="Ferry_xpress.jpg" timestamp="2014-11-23T00:35:24Z" user="Dan" url="http://wikioverland.org/images/5/51/Ferry_xpress.jpg" descriptionurl="http://wikioverland.org/File:Ferry_xpress.jpg" ns="6" title="File:Ferry xpress.jpg" />
      <img name="Edit_clear.png" timestamp="2011-10-13T06:03:56Z" user="Dan" url="http://wikioverland.org/images/d/d8/Edit_clear.png" descriptionurl="http://wikioverland.org/File:Edit_clear.png" ns="6" title="File:Edit clear.png" />
      <img name="Ambox_protection.png" timestamp="2011-10-13T06:01:20Z" user="Dan" url="http://wikioverland.org/images/f/fc/Ambox_protection.png" descriptionurl="http://wikioverland.org/File:Ambox_protection.png" ns="6" title="File:Ambox protection.png" />
      <img name="Ambox_move.png" timestamp="2011-10-13T06:00:25Z" user="Dan" url="http://wikioverland.org/images/0/05/Ambox_move.png" descriptionurl="http://wikioverland.org/File:Ambox_move.png" ns="6" title="File:Ambox move.png" />
      <img name="Ambox_speedy_deletion.png" timestamp="2011-10-13T05:53:01Z" user="Dan" url="http://wikioverland.org/images/8/8a/Ambox_speedy_deletion.png" descriptionurl="http://wikioverland.org/File:Ambox_speedy_deletion.png" ns="6" title="File:Ambox speedy deletion.png" />
      <img name="Ambox_content.png" timestamp="2011-10-13T05:28:29Z" user="Dan" url="http://wikioverland.org/images/f/f4/Ambox_content.png" descriptionurl="http://wikioverland.org/File:Ambox_content.png" ns="6" title="File:Ambox content.png" />
      <img name="Ambox_notice.png" timestamp="2011-10-13T05:19:15Z" user="Dan" url="http://wikioverland.org/images/c/c8/Ambox_notice.png" descriptionurl="http://wikioverland.org/File:Ambox_notice.png" ns="6" title="File:Ambox notice.png" />
    </allimages>
  </query>
</api>