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="B._Fed_Flag.PNG|169780" />
  </query-continue>
  <query>
    <pages>
      <page pageid="20469" ns="0" title="Nation/Banana Federation" />
      <page pageid="42969" ns="0" title="Lothinese Crisis" />
      <page pageid="130371" ns="10" title="Template:Country data Banana Federation" />
      <page pageid="130376" ns="0" title="Equipment of the Ironian Federal Army" />
      <page pageid="131875" ns="0" title="Fortunan Armed Forces" />
      <page pageid="158111" ns="0" title="Royal Kuthern Air Force" />
      <page pageid="163808" ns="0" title="Equipment of the Ironian Federal Navy" />
      <page pageid="164417" ns="0" title="Damanian War" />
      <page pageid="167282" ns="0" title="Bananish Defence Forces" />
      <page pageid="167283" ns="10" title="Template:Banana Federation topics" />
    </pages>
  </query>
</api>