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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="Александр Приходько" />
      <u name="Владимир Закалюкин" />
      <u name="Дмитрий Аносов" />
      <u name="Илья Богаевский" />
      <u name="Илья Шкредов" />
      <u name="Максим Липатов" />
      <u name="Максим Липатов" />
    </allusers>
  </query>
</api>