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="Car_Insurance_1791.jpg|3784" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="File:Bad Credit Car Loans 4161.jpg" />
      <f ns="6" title="File:Bad Credit Payday Loans 1693.jpg" />
      <f ns="6" title="File:Best Home Loans 1287.jpg" />
      <f ns="6" title="File:Best home loans, best mortgages, mortgage comparison, mortgage broker 2703.jpg" />
      <f ns="6" title="File:Bulk powder handling 1728.jpg" />
      <f ns="6" title="File:Camper Trailers 4362.jpg" />
      <f ns="6" title="File:CarLoans,CarLoan 3612.jpg" />
      <f ns="6" title="File:Car Finance 3041.jpg" />
      <f ns="6" title="File:Car Games 5171.jpg" />
      <f ns="6" title="File:Car Insurance, Cheap Car Insurance 2835.jpg" />
    </allfileusages>
  </query>
</api>