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 gafcontinue="Daraidze.jpg|281" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4" ns="12" title="Справка:О проекте" />
      <page pageid="510" ns="0" title="Belotero" />
      <page pageid="1144" ns="0" title="Фоменко Оксана Анатольевна" />
      <page pageid="1184" ns="0" title="Комедон" />
      <page pageid="1299" ns="10" title="Шаблон:Protected" />
      <page pageid="1618" ns="0" title="Dr Kadir" />
      <page pageid="2434" ns="0" title="Чекалин Тимофей Владимирович" />
      <page pageid="2483" ns="0" title="Ударно-волновая терапия" />
      <page pageid="2488" ns="0" title="Белова Светлана Викторовна" />
      <page pageid="2497" ns="6" title="Файл:IMG 0213.JPG" />
    </pages>
  </query>
</api>