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="Spfleisch_döner.jpg" timestamp="2017-09-11T11:47:23Z" user="Dfaslak" url="http://www.halalwiki.net/images/2/2c/Spfleisch_d%C3%B6ner.jpg" descriptionurl="http://www.halalwiki.net/index.php?title=Datei:Spfleisch_d%C3%B6ner.jpg" ns="6" title="Datei:Spfleisch döner.jpg" />
      <img name="10808378_1508490212735937_45031846_n.jpg" timestamp="2014-12-10T20:42:13Z" user="Dfaslak" url="http://www.halalwiki.net/images/5/5d/10808378_1508490212735937_45031846_n.jpg" descriptionurl="http://www.halalwiki.net/index.php?title=Datei:10808378_1508490212735937_45031846_n.jpg" ns="6" title="Datei:10808378 1508490212735937 45031846 n.jpg" />
      <img name="Schue2.jpg" timestamp="2014-10-16T18:49:11Z" user="Dfaslak" url="http://www.halalwiki.net/images/2/27/Schue2.jpg" descriptionurl="http://www.halalwiki.net/index.php?title=Datei:Schue2.jpg" ns="6" title="Datei:Schue2.jpg" />
      <img name="Schque.jpg" timestamp="2014-10-16T17:47:37Z" user="Ihyildiz" url="http://www.halalwiki.net/images/e/e8/Schque.jpg" descriptionurl="http://www.halalwiki.net/index.php?title=Datei:Schque.jpg" ns="6" title="Datei:Schque.jpg" />
    </allimages>
  </query>
</api>