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="Bing.com-favicon.png|129" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3" ns="0" title="Elektrit" />
      <page pageid="36" ns="0" title="Kauno radijo gamykla" />
      <page pageid="39" ns="0" title="Esbrok" />
      <page pageid="99" ns="0" title="Klaipėdos radiofonas" />
      <page pageid="101" ns="6" title="Vaizdas:Vieciunu-TV.jpg" />
      <page pageid="102" ns="0" title="Viečiūnų TV" />
      <page pageid="126" ns="6" title="Vaizdas:Sitkunai radijo stotis antenos.jpg" />
      <page pageid="169" ns="0" title="RTV leidiniai" />
      <page pageid="208" ns="0" title="Banga" />
      <page pageid="296" ns="0" title="Valteris Kristupas Banaitis" />
    </pages>
  </query>
</api>