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="2016-07-01T14:39:10Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="Echosphere_final.png" timestamp="2016-07-01T14:51:07Z" user="Olav" url="http://gsm.hyperbody.nl/images/6/67/Echosphere_final.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:Echosphere_final.png" ns="6" title="File:Echosphere final.png" />
      <img name="160626_FINAL_Presentation_EchoSphere28.png" timestamp="2016-07-01T14:46:36Z" user="Olav" url="http://gsm.hyperbody.nl/images/d/d0/160626_FINAL_Presentation_EchoSphere28.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere28.png" ns="6" title="File:160626 FINAL Presentation EchoSphere28.png" />
      <img name="160626_FINAL_Presentation_EchoSphere33.png" timestamp="2016-07-01T14:45:33Z" user="Olav" url="http://gsm.hyperbody.nl/images/0/09/160626_FINAL_Presentation_EchoSphere33.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere33.png" ns="6" title="File:160626 FINAL Presentation EchoSphere33.png" />
      <img name="160626_FINAL_Presentation_EchoSphere32.png" timestamp="2016-07-01T14:45:11Z" user="Olav" url="http://gsm.hyperbody.nl/images/4/4b/160626_FINAL_Presentation_EchoSphere32.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere32.png" ns="6" title="File:160626 FINAL Presentation EchoSphere32.png" />
      <img name="160626_FINAL_Presentation_EchoSphere31.png" timestamp="2016-07-01T14:44:43Z" user="Olav" url="http://gsm.hyperbody.nl/images/6/6f/160626_FINAL_Presentation_EchoSphere31.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere31.png" ns="6" title="File:160626 FINAL Presentation EchoSphere31.png" />
      <img name="160626_FINAL_Presentation_EchoSphere30.png" timestamp="2016-07-01T14:44:23Z" user="Olav" url="http://gsm.hyperbody.nl/images/1/1e/160626_FINAL_Presentation_EchoSphere30.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere30.png" ns="6" title="File:160626 FINAL Presentation EchoSphere30.png" />
      <img name="160626_FINAL_Presentation_EchoSphere29.png" timestamp="2016-07-01T14:43:43Z" user="Olav" url="http://gsm.hyperbody.nl/images/0/0f/160626_FINAL_Presentation_EchoSphere29.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere29.png" ns="6" title="File:160626 FINAL Presentation EchoSphere29.png" />
      <img name="160626_FINAL_Presentation_EchoSphere25.png" timestamp="2016-07-01T14:42:32Z" user="Olav" url="http://gsm.hyperbody.nl/images/a/a2/160626_FINAL_Presentation_EchoSphere25.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere25.png" ns="6" title="File:160626 FINAL Presentation EchoSphere25.png" />
      <img name="160626_FINAL_Presentation_EchoSphere27.png" timestamp="2016-07-01T14:42:03Z" user="Olav" url="http://gsm.hyperbody.nl/images/1/1f/160626_FINAL_Presentation_EchoSphere27.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere27.png" ns="6" title="File:160626 FINAL Presentation EchoSphere27.png" />
      <img name="160626_FINAL_Presentation_EchoSphere20.png" timestamp="2016-07-01T14:40:55Z" user="Olav" url="http://gsm.hyperbody.nl/images/6/60/160626_FINAL_Presentation_EchoSphere20.png" descriptionurl="http://gsm.hyperbody.nl/index.php/File:160626_FINAL_Presentation_EchoSphere20.png" ns="6" title="File:160626 FINAL Presentation EchoSphere20.png" />
    </allimages>
  </query>
</api>