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>
    <allimages gaicontinue="Create_email_address.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="128" ns="6" title="Datoteka:Account.png" />
      <page pageid="123" ns="6" title="Datoteka:Account myprofile contact details.png" />
      <page pageid="122" ns="6" title="Datoteka:Account myprofile general.png" />
      <page pageid="104" ns="6" title="Datoteka:Add domain alias.png" />
      <page pageid="119" ns="6" title="Datoteka:Add new database.png" />
      <page pageid="102" ns="6" title="Datoteka:Add new domain.png" />
      <page pageid="116" ns="6" title="Datoteka:Add new ftp account for domain.png" />
      <page pageid="103" ns="6" title="Datoteka:Add new subdomain.png" />
      <page pageid="124" ns="6" title="Datoteka:Change settings mail.png" />
      <page pageid="112" ns="6" title="Datoteka:Changesettings useradd.png" />
    </pages>
  </query>
</api>