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>
    <allfileusages afcontinue="Christ_saviour_explosion.jpg|24271" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="Файл:BCGN Kirov 1983.JPG" />
      <f ns="6" title="Файл:Boris Kovynev&#039;s 2nd Book of Lyrics Cover.png" />
      <f ns="6" title="Файл:Bulbul 14.jpg" />
      <f ns="6" title="Файл:Bundesarchiv Bild 102-10447, Albert Einstein.jpg" />
      <f ns="6" title="Файл:Carter Brezhnev sign SALT II.jpg" />
      <f ns="6" title="Файл:Cast and crew of Anora at the 2024 Toronto International Film Festival.jpg" />
      <f ns="6" title="Файл:Chaliapin F. (Шаляпин Ф. И.) 1937-38.jpg" />
      <f ns="6" title="Файл:Changes in national boundaries after the end of the Cold War.jpg" />
      <f ns="6" title="Файл:Chelenger band.jpg" />
      <f ns="6" title="Файл:Chimera 1991.jpg" />
    </allfileusages>
  </query>
</api>