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="Ebisi_company_re_se.gif" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="文件:Bi system importent.gif" />
      <f ns="6" title="文件:Bi system know2.gif" />
      <f ns="6" title="文件:Border-box-model.gif" />
      <f ns="6" title="文件:Colinivy bbs attach ie8.jpg" />
      <f ns="6" title="文件:Colinivy case post.gif" />
      <f ns="6" title="文件:Colinivy case share.gif" />
      <f ns="6" title="文件:Colinivy case upload.gif" />
      <f ns="6" title="文件:Ebisi activation th.gif" />
      <f ns="6" title="文件:Ebisi company information.gif" />
      <f ns="6" title="文件:Ebisi company job.gif" />
    </allfileusages>
  </query>
</api>