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 aicontinue="BjornAstrand_2013FebWorkshop.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Bar_graph_2.jpg" timestamp="2014-06-26T03:04:14Z" url="https://wiki.hh.se/ceres/images/b/b5/Bar_graph_2.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bar_graph_2.jpg" ns="6" title="File:Bar graph 2.jpg" />
      <img name="Bar_graph_3.jpg" timestamp="2014-06-26T02:55:05Z" url="https://wiki.hh.se/ceres/images/d/de/Bar_graph_3.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bar_graph_3.jpg" ns="6" title="File:Bar graph 3.jpg" />
      <img name="Bernhard_aichernig_hsst_2018_slides.pdf" timestamp="2018-06-14T08:13:48Z" url="https://wiki.hh.se/ceres/images/4/46/Bernhard_aichernig_hsst_2018_slides.pdf" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bernhard_aichernig_hsst_2018_slides.pdf" ns="6" title="File:Bernhard aichernig hsst 2018 slides.pdf" />
      <img name="Bertil-Svensson.jpg" timestamp="2014-06-26T02:09:28Z" url="https://wiki.hh.se/ceres/images/a/aa/Bertil-Svensson.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bertil-Svensson.jpg" ns="6" title="File:Bertil-Svensson.jpg" />
      <img name="Bertil_s.jpg" timestamp="2014-06-26T02:55:25Z" url="https://wiki.hh.se/ceres/images/b/b4/Bertil_s.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bertil_s.jpg" ns="6" title="File:Bertil s.jpg" />
      <img name="Betor.jpg" timestamp="2014-06-26T02:05:45Z" url="https://wiki.hh.se/ceres/images/2/21/Betor.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Betor.jpg" ns="6" title="File:Betor.jpg" />
      <img name="Bilstrup.jpg" timestamp="2014-06-26T02:58:58Z" url="https://wiki.hh.se/ceres/images/6/63/Bilstrup.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bilstrup.jpg" ns="6" title="File:Bilstrup.jpg" />
      <img name="Bitops.zip" timestamp="2014-06-26T02:54:14Z" url="https://wiki.hh.se/ceres/images/5/50/Bitops.zip" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bitops.zip" ns="6" title="File:Bitops.zip" />
      <img name="Bjoern_head_medium.jpg" timestamp="2014-06-26T02:37:14Z" url="https://wiki.hh.se/ceres/images/f/f0/Bjoern_head_medium.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bjoern_head_medium.jpg" ns="6" title="File:Bjoern head medium.jpg" />
      <img name="Bjorn.jpg" timestamp="2014-06-26T03:14:02Z" url="https://wiki.hh.se/ceres/images/0/07/Bjorn.jpg" descriptionurl="https://wiki.hh.se/ceres/index.php/File:Bjorn.jpg" ns="6" title="File:Bjorn.jpg" />
    </allimages>
  </query>
</api>