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="Cat_wall_4.JPG" />
  </query-continue>
  <query>
    <allimages>
      <img name="Ballscrews_rev_b.jpg" timestamp="2017-04-28T20:34:56Z" url="http://www.hentschel.net/w/images/7/7e/Ballscrews_rev_b.jpg" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Ballscrews_rev_b.jpg" ns="6" title="File:Ballscrews rev b.jpg" />
      <img name="Bern-muerren.png" timestamp="2018-03-06T07:23:28Z" url="http://www.hentschel.net/w/images/9/92/Bern-muerren.png" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Bern-muerren.png" ns="6" title="File:Bern-muerren.png" />
      <img name="Bernardo_Bellotto,_il_Canaletto_-_View_of_Dresden_from_the_Right_Bank_of_the_Elbe_with_the_Augustus_Bridge_-_WGA01824.jpg" timestamp="2018-04-10T05:55:04Z" url="http://www.hentschel.net/w/images/2/22/Bernardo_Bellotto%2C_il_Canaletto_-_View_of_Dresden_from_the_Right_Bank_of_the_Elbe_with_the_Augustus_Bridge_-_WGA01824.jpg" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Bernardo_Bellotto,_il_Canaletto_-_View_of_Dresden_from_the_Right_Bank_of_the_Elbe_with_the_Augustus_Bridge_-_WGA01824.jpg" ns="6" title="File:Bernardo Bellotto, il Canaletto - View of Dresden from the Right Bank of the Elbe with the Augustus Bridge - WGA01824.jpg" />
      <img name="Cam08-frontdoor.png" timestamp="2020-02-16T01:51:43Z" url="http://www.hentschel.net/w/images/7/72/Cam08-frontdoor.png" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Cam08-frontdoor.png" ns="6" title="File:Cam08-frontdoor.png" />
      <img name="Camera_enclosure.jpg" timestamp="2016-12-15T04:51:08Z" url="http://www.hentschel.net/w/images/a/af/Camera_enclosure.jpg" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Camera_enclosure.jpg" ns="6" title="File:Camera enclosure.jpg" />
      <img name="Camera_in_enclosure.jpg" timestamp="2016-12-15T04:51:38Z" url="http://www.hentschel.net/w/images/7/7b/Camera_in_enclosure.jpg" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Camera_in_enclosure.jpg" ns="6" title="File:Camera in enclosure.jpg" />
      <img name="Camera_schematics.jpg" timestamp="2016-12-15T05:04:35Z" url="http://www.hentschel.net/w/images/a/ac/Camera_schematics.jpg" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Camera_schematics.jpg" ns="6" title="File:Camera schematics.jpg" />
      <img name="Cat_wall_1.JPG" timestamp="2017-04-03T04:11:56Z" url="http://www.hentschel.net/w/images/3/3c/Cat_wall_1.JPG" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Cat_wall_1.JPG" ns="6" title="File:Cat wall 1.JPG" />
      <img name="Cat_wall_2.JPG" timestamp="2017-04-03T04:12:10Z" url="http://www.hentschel.net/w/images/1/1f/Cat_wall_2.JPG" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Cat_wall_2.JPG" ns="6" title="File:Cat wall 2.JPG" />
      <img name="Cat_wall_3.JPG" timestamp="2017-04-03T04:12:27Z" url="http://www.hentschel.net/w/images/e/ed/Cat_wall_3.JPG" descriptionurl="http://www.hentschel.net/w/index.php?title=File:Cat_wall_3.JPG" ns="6" title="File:Cat wall 3.JPG" />
    </allimages>
  </query>
</api>