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="126" ns="0" title="BEC lecture" />
      <p pageid="28" ns="0" title="Bezpieczeństwo w sieci" />
      <p pageid="38" ns="0" title="Biblioteka" />
      <p pageid="14" ns="0" title="Blokada portu 25" />
      <p pageid="127" ns="0" title="Bose - Einstein condensation in solid state systems" />
      <p pageid="16" ns="0" title="Ecfa2010" />
      <p pageid="7" ns="0" title="Edytowanie stron" />
      <p pageid="29" ns="0" title="Katalogi domowe studentów" />
      <p pageid="25" ns="0" title="Konta i hasła w sieci studenckiej" />
      <p pageid="19" ns="0" title="OKWF" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Oprogramowanie" />
  </query-continue>
</api>