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="2018-11-17T15:52:23Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="P5_MICRO_-18.png" timestamp="2018-11-17T15:57:41Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/d/d2/P5_MICRO_-18.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_-18.png" ns="6" title="File:P5 MICRO -18.png" />
      <img name="P5_MICRO_026_copy_2.png" timestamp="2018-11-17T15:57:09Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/3/36/P5_MICRO_026_copy_2.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_026_copy_2.png" ns="6" title="File:P5 MICRO 026 copy 2.png" />
      <img name="P5_MICRO_-19.png" timestamp="2018-11-17T15:56:10Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/b/b1/P5_MICRO_-19.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_-19.png" ns="6" title="File:P5 MICRO -19.png" />
      <img name="P5_MICRO_027_copy.png" timestamp="2018-11-17T15:55:47Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/1/1b/P5_MICRO_027_copy.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_027_copy.png" ns="6" title="File:P5 MICRO 027 copy.png" />
      <img name="P5_MICRO_026_copy.png" timestamp="2018-11-17T15:55:10Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/a/a9/P5_MICRO_026_copy.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_026_copy.png" ns="6" title="File:P5 MICRO 026 copy.png" />
      <img name="P5_MICRO_025_copy.png" timestamp="2018-11-17T15:54:44Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/7/7c/P5_MICRO_025_copy.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_025_copy.png" ns="6" title="File:P5 MICRO 025 copy.png" />
      <img name="P5_MICRO_029.png" timestamp="2018-11-17T15:54:09Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/c/c3/P5_MICRO_029.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_029.png" ns="6" title="File:P5 MICRO 029.png" />
      <img name="P5_MICRO_026.png" timestamp="2018-11-17T15:53:49Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/7/73/P5_MICRO_026.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_026.png" ns="6" title="File:P5 MICRO 026.png" />
      <img name="P5_MICRO_025.png" timestamp="2018-11-17T15:53:33Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/b/b4/P5_MICRO_025.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_025.png" ns="6" title="File:P5 MICRO 025.png" />
      <img name="P5_MICRO_024.png" timestamp="2018-11-17T15:53:02Z" user="Marco Galli" url="http://rbse.hyperbody.nl/images/a/aa/P5_MICRO_024.png" descriptionurl="http://rbse.hyperbody.nl/index.php/File:P5_MICRO_024.png" ns="6" title="File:P5 MICRO 024.png" />
    </allimages>
  </query>
</api>