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 aistart="2020-07-01T11:15:38Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="South_view.jpg" timestamp="2020-11-04T13:52:06Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/f/f9/South_view.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:South_view.jpg" ns="6" title="File:South view.jpg" />
      <img name="South_sky.jpg" timestamp="2020-11-04T13:51:28Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/e/e7/South_sky.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:South_sky.jpg" ns="6" title="File:South sky.jpg" />
      <img name="East_entrance.jpg" timestamp="2020-11-04T13:51:00Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/7/75/East_entrance.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:East_entrance.jpg" ns="6" title="File:East entrance.jpg" />
      <img name="Entrance_west2.jpg" timestamp="2020-11-04T13:50:36Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/f/fa/Entrance_west2.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:Entrance_west2.jpg" ns="6" title="File:Entrance west2.jpg" />
      <img name="North_view.jpg" timestamp="2020-11-04T13:50:07Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/9/9e/North_view.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:North_view.jpg" ns="6" title="File:North view.jpg" />
      <img name="Sky_view_clouds.jpg" timestamp="2020-11-04T13:49:40Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/4/42/Sky_view_clouds.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:Sky_view_clouds.jpg" ns="6" title="File:Sky view clouds.jpg" />
      <img name="Banner_sky.jpg" timestamp="2020-11-04T13:32:01Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/a/a8/Banner_sky.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:Banner_sky.jpg" ns="6" title="File:Banner sky.jpg" />
      <img name="IMG_7064_copy_compressed.jpg" timestamp="2020-07-21T15:51:32Z" user="Max" url="http://100ybp.roboticbuilding.eu/images/7/78/IMG_7064_copy_compressed.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:IMG_7064_copy_compressed.jpg" ns="6" title="File:IMG 7064 copy compressed.jpg" />
      <img name="IMG_1027_copy.jpg" timestamp="2020-07-21T15:46:43Z" user="Max" url="http://100ybp.roboticbuilding.eu/images/9/9a/IMG_1027_copy.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:IMG_1027_copy.jpg" ns="6" title="File:IMG 1027 copy.jpg" />
      <img name="North_facade.jpg" timestamp="2020-07-01T11:21:33Z" user="Erik" url="http://100ybp.roboticbuilding.eu/images/f/f6/North_facade.jpg" descriptionurl="http://100ybp.roboticbuilding.eu/index.php/File:North_facade.jpg" ns="6" title="File:North facade.jpg" />
    </allimages>
  </query>
</api>