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>
    <alltransclusions gatcontinue="В_работе|155" />
  </query-continue>
  <query>
    <pages>
      <page pageid="24" ns="2" title="Участник:Fenixs" />
      <page pageid="35" ns="0" title="Полезные шаблоны" />
      <page pageid="36" ns="0" title="FAQ по движку и быстрые команды" />
      <page pageid="41" ns="10" title="Шаблон:Test2" />
      <page pageid="55" ns="0" title="Охотник на демонов" />
      <page pageid="56" ns="0" title="Варвар" />
      <page pageid="58" ns="0" title="Монах" />
      <page pageid="59" ns="0" title="Чародей" />
      <page pageid="60" ns="0" title="Крестоносец" />
      <page pageid="68" ns="8" title="MediaWiki:Common.css" />
    </pages>
  </query>
</api>