You are looking at the HTML representation of the XML format.
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>
    <exturlusage>
      <eu pageid="28593" ns="2" title="Участник:Admin/BlogEntry: 2010 January 14 09:30:43 SAMT" url="http://www.mediawiki.org/wiki/Extension:FramedVideo" />
      <eu pageid="62767" ns="0" title="Widget:SlideShare" url="http://www.mediawiki.org/wiki/Extension:Widgets" />
      <eu pageid="17064" ns="2" title="Участник:Admin/BlogEntry: 2009 February 06 09:55:57 SAMT" url="http://www.mediawiki.org/wiki/Extension:YouTubeTag" />
      <eu pageid="21926" ns="14" title="Категория:Летописи &quot;Тольятти от А до Я&quot;" url="http://www.mediawiki.org/wiki/Help:Configuration_settings" />
    </exturlusage>
  </query>
</api>