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>
    <allpages gapcontinue="Голосовые_сообщения_Marble" />
  </query-continue>
  <query>
    <pages>
      <page pageid="6" ns="0" title="TODO" contentmodel="wikitext" pagelanguage="ru" touched="2011-06-05T06:41:53Z" lastrevid="442" counter="14802" length="421" />
      <page pageid="69" ns="0" title="TranslationAdvice" contentmodel="wikitext" pagelanguage="ru" touched="2018-10-21T09:02:03Z" lastrevid="77388" counter="2527" length="399" />
      <page pageid="21" ns="0" title="Глоссарий KDE" contentmodel="wikitext" pagelanguage="ru" touched="2018-09-22T19:34:12Z" lastrevid="77368" counter="178597" length="143" />
      <page pageid="68" ns="0" title="Голосовые команды Marble" contentmodel="wikitext" pagelanguage="ru" touched="2018-10-21T09:15:14Z" lastrevid="485" counter="1732" length="80" redirect="" new="" />
    </pages>
  </query>
</api>