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>
    <allfileusages gafcontinue="Bacévyčia.jpg|7673" />
  </query-continue>
  <query>
    <pages>
      <page pageid="37" ns="0" title="Zeppelinus" />
      <page pageid="1912" ns="0" title="Banana Torture" />
      <page pageid="2207" ns="0" title="Ledų šventė" />
      <page pageid="7467" ns="0" title="Audrius Bačiulis" />
      <page pageid="7580" ns="0" title="Pipedijos žaidimas" />
      <page pageid="7673" ns="0" title="Bacevyčia" />
      <page pageid="13000" ns="0" title="Moskvič 408" />
      <page pageid="17707" ns="0" title="Novorusija" />
      <page pageid="19106" ns="0" title="BWRaep" />
    </pages>
  </query>
</api>