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 apcontinue="ELMOR" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="55" ns="0" title="Bejca do mięs 01" />
      <p pageid="73" ns="0" title="Caldo Verde" />
      <p pageid="100" ns="0" title="Checklista przed commitem" />
      <p pageid="65" ns="0" title="Chleb w jajku" />
      <p pageid="82" ns="0" title="Ciasto na gofry" />
      <p pageid="30" ns="0" title="Ciasto na pizzę" />
      <p pageid="56" ns="0" title="Drinki" />
      <p pageid="84" ns="0" title="Dzienniki piwne" />
      <p pageid="31" ns="0" title="Dzienniki wyrobu wina" />
      <p pageid="98" ns="0" title="Dżem z wiśni" />
    </allpages>
  </query>
</api>