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>
    <embeddedin eicontinue="10|Stub|121" />
  </query-continue>
  <query>
    <embeddedin>
      <ei pageid="54" ns="0" title="Қасым сұлтан" />
      <ei pageid="56" ns="0" title="Абдолла Хан I" />
      <ei pageid="62" ns="0" title="Елбарыс хан" />
      <ei pageid="65" ns="0" title="Қоншақ" />
      <ei pageid="69" ns="0" title="Бөлекей" />
      <ei pageid="72" ns="0" title="Артық Сарыханұлы" />
      <ei pageid="84" ns="0" title="Бөкейхан Барақұлы" />
      <ei pageid="90" ns="0" title="Бөкей хан" />
      <ei pageid="111" ns="0" title="Жолбарыс хан" />
      <ei pageid="119" ns="0" title="Қазақ хандықтарының сыртқы саясаты мен дипломатиясы (15-17 ғасыр)" />
    </embeddedin>
  </query>
</api>