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 gaicontinue="20190503_Polar_Mount.pdf" />
  </query-continue>
  <query>
    <pages>
      <page pageid="168" ns="6" title="Bestand:20180426 084801 resized.jpg" />
      <page pageid="98" ns="6" title="Bestand:1.jpg" />
      <page pageid="63" ns="6" title="Bestand:10 GHZ RX.png" />
      <page pageid="79" ns="6" title="Bestand:20141024 222115.jpg" />
      <page pageid="64" ns="6" title="Bestand:10 GHZ TX.png" />
      <page pageid="220" ns="6" title="Bestand:164spot.JPG" />
      <page pageid="276" ns="6" title="Bestand:1vis.jpg" />
      <page pageid="222" ns="6" title="Bestand:164spot.jpg" />
      <page pageid="77" ns="6" title="Bestand:20141024 222121.jpg" />
      <page pageid="223" ns="6" title="Bestand:164.jpg" />
    </pages>
  </query>
</api>