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>
    <alllinks galcontinue="BIBFRAME|5409" />
  </query-continue>
  <query>
    <pages>
      <page pageid="5" ns="0" title="Kognitivní psychologie" />
      <page pageid="267" ns="0" title="Psychologie osobnosti" />
      <page pageid="276" ns="0" title="Behaviorismus" />
      <page pageid="317" ns="0" title="Socializace jedince" />
      <page pageid="628" ns="100" title="Portál:Projekty" />
      <page pageid="1493" ns="0" title="Edward Thorndike" />
      <page pageid="1862" ns="0" title="Humanistická psychologie" />
      <page pageid="2346" ns="0" title="Bill Gates" />
      <page pageid="3432" ns="0" title="Linus Torvalds" />
      <page pageid="3814" ns="0" title="Mark Zuckerberg" />
    </pages>
  </query>
</api>