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HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <allusers>
      <u name="YardaneBarrow989" />
      <u name="YaremaCanning3443" />
      <u name="YasirLaverock1551" />
      <u name="YitzchakWinterton2389" />
      <u name="ZachaiosEvelyn2780" />
      <u name="ZachariasWilton3008" />
    </allusers>
  </query>
</api>