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="Datos0.png|2452" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="File:CODM Events.jpg" />
      <f ns="6" title="File:CODMobileCPGuide.jpg" />
      <f ns="6" title="File:CODMobile Event Reward Screenshot.jpg" />
      <f ns="6" title="File:Chrono-Crystals-DBL.jpg" />
      <f ns="6" title="File:Chrono Crystal Earning Methods.png" />
      <f ns="6" title="File:Covet-fashion-daily-challenge-example.jpg" />
      <f ns="6" title="File:CovetFashion2026Rewards.jpg" />
      <f ns="6" title="File:Covet Fashion Challenge Screenshot.jpg" />
      <f ns="6" title="File:Covet Fashion Challenge Screenshot.jpg" />
      <f ns="6" title="File:Covet Fashion Screenshot Legal Rewards.jpg" />
    </allfileusages>
  </query>
</api>