You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <allpages>
      <p pageid="17" ns="0" title="Degenerirana perturbacija" />
      <p pageid="4" ns="0" title="Domače naloge" />
      <p pageid="110" ns="0" title="Glavna stran" />
      <p pageid="1" ns="0" title="Glavna stran 2011 - 2012" />
      <p pageid="12" ns="0" title="Glavna stran 2012 - 2013" />
      <p pageid="22" ns="0" title="Glavna stran 2013 - 2014" />
      <p pageid="29" ns="0" title="Glavna stran 2014 - 2015" />
      <p pageid="36" ns="0" title="Glavna stran 2015 - 2016" />
      <p pageid="42" ns="0" title="Glavna stran 2016 - 2017" />
      <p pageid="49" ns="0" title="Glavna stran 2017 - 2018" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Glavna stran 2018 - 2019" />
  </query-continue>
</api>