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="Bill_Houston_-_The_King_Of_White_Otter_Lake_front.jpg|4418" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1382" ns="0" title="The Fugitives" />
      <page pageid="1750" ns="0" title="Back-Roads" />
      <page pageid="1779" ns="0" title="Baycore" />
      <page pageid="2541" ns="0" title="Baycore Compilations" />
      <page pageid="2568" ns="0" title="Bill Houston" />
      <page pageid="3062" ns="0" title="Burnz N Hell" />
      <page pageid="4417" ns="0" title="Bring Back The Music (Album)" />
      <page pageid="4419" ns="0" title="North Of Superior (Album)" />
      <page pageid="4423" ns="0" title="Open Spaces (Single)" />
      <page pageid="4428" ns="0" title="Christmas Time Is Coming (Single)" />
    </pages>
  </query>
</api>