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="Black_Spiral_Dancers.gif|2796" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1627" ns="0" title="The Body" />
      <page pageid="1635" ns="0" title="Megan &quot;The Dentist&quot; Cavanough" />
      <page pageid="1778" ns="0" title="Elene" />
      <page pageid="1779" ns="0" title="Athena" />
      <page pageid="1818" ns="0" title="Daniel Rose" />
      <page pageid="1904" ns="0" title="The Garou Ferret" />
      <page pageid="1947" ns="0" title="Mac" />
      <page pageid="2264" ns="0" title="Ananke &quot;Focus&quot;" />
      <page pageid="2564" ns="0" title="Milos &quot;Wachter van Tartarus&quot; Miria" />
      <page pageid="2795" ns="0" title="Haringvat" />
    </pages>
  </query>
</api>