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"?>
    <allfileusages gafcontinue="BackArrow_Off.png|167963" />
      <page pageid="7275" ns="0" title="Burning Life" />
      <page pageid="17390" ns="0" title="Open Grid Public Beta/Daily Huddle Transcripts/Transcript 20080815" />
      <page pageid="101763" ns="0" title="Bug Tracker/Status" />
      <page pageid="127822" ns="0" title="Viewer Help Templates" />
      <page pageid="197970" ns="0" title="LDPW Nautilus" />
      <page pageid="199708" ns="0" title="Solution Provider Directory" />
      <page pageid="202206" ns="0" title="Babbage Microcontinent" />
      <page pageid="202208" ns="0" title="Babbage Railway" />