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="Архив_картинок_в_изгнании" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1428" ns="0" title="Wiki" contentmodel="wikitext" pagelanguage="ru" touched="2013-06-14T03:07:33Z" lastrevid="3492" counter="12212" length="2811" />
      <page pageid="1471" ns="0" title="Анонимные Деды Морозы" contentmodel="wikitext" pagelanguage="ru" touched="2013-02-07T14:39:44Z" lastrevid="3147" counter="13653" length="4466" />
      <page pageid="1750" ns="0" title="Антимонгольский язык" contentmodel="wikitext" pagelanguage="ru" touched="2017-07-10T06:57:47Z" lastrevid="3619" counter="3721" length="1526" />
      <page pageid="1467" ns="0" title="Архив Картинок" contentmodel="wikitext" pagelanguage="ru" touched="2013-02-28T06:59:21Z" lastrevid="3399" counter="17993" length="1722" />
    </pages>
  </query>
</api>