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="Ele-profile2.png|63" />
  </query-continue>
  <query>
    <pages>
      <page pageid="12" ns="0" title="ЧПУ" />
      <page pageid="46" ns="0" title="Статьи" />
      <page pageid="51" ns="0" title="Произвольный блок" />
      <page pageid="63" ns="0" title="Дистанционное обучение" />
      <page pageid="83" ns="0" title="Учётная запись" />
      <page pageid="88" ns="0" title="Соблюдение требований" />
    </pages>
  </query>
</api>