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="20200609083020|Лагутенкова_Юлия_Юрьевна.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Служебные_помещения.jpg" timestamp="2021-03-14T22:17:07Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/7/7e/%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D1%8B%D0%B5_%D0%BF%D0%BE%D0%BC%D0%B5%D1%89%D0%B5%D0%BD%D0%B8%D1%8F.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D1%8B%D0%B5_%D0%BF%D0%BE%D0%BC%D0%B5%D1%89%D0%B5%D0%BD%D0%B8%D1%8F.jpg" ns="6" title="Файл:Служебные помещения.jpg" />
      <img name="Renova.jpg" timestamp="2021-03-14T22:10:14Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/d/d4/Renova.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:Renova.jpg" ns="6" title="Файл:Renova.jpg" />
      <img name="Ожидание.jpg" timestamp="2021-03-14T22:06:41Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/d/d2/%D0%9E%D0%B6%D0%B8%D0%B4%D0%B0%D0%BD%D0%B8%D0%B5.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:%D0%9E%D0%B6%D0%B8%D0%B4%D0%B0%D0%BD%D0%B8%D0%B5.jpg" ns="6" title="Файл:Ожидание.jpg" />
      <img name="Гинекологический_кабинет.jpg" timestamp="2021-03-14T22:02:24Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/a/a6/%D0%93%D0%B8%D0%BD%D0%B5%D0%BA%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B9_%D0%BA%D0%B0%D0%B1%D0%B8%D0%BD%D0%B5%D1%82.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:%D0%93%D0%B8%D0%BD%D0%B5%D0%BA%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B9_%D0%BA%D0%B0%D0%B1%D0%B8%D0%BD%D0%B5%D1%82.jpg" ns="6" title="Файл:Гинекологический кабинет.jpg" />
      <img name="Палата.jpg" timestamp="2021-03-14T21:59:11Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/d/d2/%D0%9F%D0%B0%D0%BB%D0%B0%D1%82%D0%B0.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:%D0%9F%D0%B0%D0%BB%D0%B0%D1%82%D0%B0.jpg" ns="6" title="Файл:Палата.jpg" />
      <img name="InnMed.jpeg" timestamp="2021-03-08T10:22:20Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/b/b8/InnMed.jpeg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:InnMed.jpeg" ns="6" title="Файл:InnMed.jpeg" />
      <img name="Front.jpg" timestamp="2021-03-07T15:42:00Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/7/70/Front.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:Front.jpg" ns="6" title="Файл:Front.jpg" />
      <img name="InnMed_-28.jpg" timestamp="2021-03-07T15:39:03Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/2/23/InnMed_-28.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:InnMed_-28.jpg" ns="6" title="Файл:InnMed -28.jpg" />
      <img name="Innmed_gold_gray_1.png" timestamp="2021-03-07T15:17:45Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/0/06/Innmed_gold_gray_1.png" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:Innmed_gold_gray_1.png" ns="6" title="Файл:Innmed gold gray 1.png" />
      <img name="Хаваева.jpg" timestamp="2020-09-15T12:19:22Z" user="Sclassw" url="https://wiki.s-classclinic.com/images/a/a6/%D0%A5%D0%B0%D0%B2%D0%B0%D0%B5%D0%B2%D0%B0.jpg" descriptionurl="https://wiki.s-classclinic.com/%D0%A4%D0%B0%D0%B9%D0%BB:%D0%A5%D0%B0%D0%B2%D0%B0%D0%B5%D0%B2%D0%B0.jpg" ns="6" title="Файл:Хаваева.jpg" />
    </allimages>
  </query>
</api>