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="Blackstones.gif|2967" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2814" ns="0" title="BAbEl" />
      <page pageid="3240" ns="0" title="Space Opera Computers" />
      <page pageid="3603" ns="0" title="Marcus Baerfaust" />
      <page pageid="3935" ns="0" title="Future Imperfect - Computers" />
      <page pageid="4056" ns="0" title="MbN-Barth" />
      <page pageid="4067" ns="0" title="MbN-Bianca Torres" />
      <page pageid="4329" ns="0" title="The West That Wasnt - Adversaries" />
      <page pageid="4367" ns="0" title="Father Benedict Tanner" />
      <page pageid="4442" ns="0" title="The Man in the Black Hood" />
    </pages>
  </query>
</api>