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>
    <pages>
      <page pageid="114" ns="0" title="QR КОД" />
      <page pageid="19" ns="0" title="ВИДОВЕ КАРТИ" />
      <page pageid="6" ns="0" title="ДОПЪЛНИТЕЛНИ ВЪЗМОЖНОСТИ" />
      <page pageid="35" ns="0" title="КАК ДА ПОДГОТВИТЕ ДИЗАЙН" />
      <page pageid="40" ns="0" title="ПЕРСОНАЛИЗАЦИЯ" />
      <page pageid="8" ns="0" title="ПРИЛОЖЕНИЕ" />
      <page pageid="61" ns="0" title="ТЕРМИНОЛОГИЧЕН РЕЧНИК" />
      <page pageid="9" ns="0" title="УСЛУГИ" />
      <page pageid="39" ns="0" title="ЧЕСТО ЗАДАВАНИ ВЪПРОСИ" />
    </pages>
  </query>
</api>