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="Students" />
  </query-continue>
  <query>
    <pages>
      <page pageid="58959" ns="0" title="Service-studdent-dohod: Заказать справку о доходах студентам, возможно при переходе по ссылке">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">&lt;websiteFrame&gt;
website=https://newyspu.ru/service-studdent-dohod/
width=100%
height=2500px
border=0
scroll=auto
&lt;/websiteFrame&gt;
&lt;br&gt;</rev>
        </revisions>
      </page>
      <page pageid="6533" ns="0" title="Services">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">* [http://{{servername}}/index.php?title=Обратная_связь&amp;uselang=en Feedback]
* [http://mail.yspu.org/ Mail YSPU]


{{category en YSPU}}</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>