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="Relbutton.gif|1502" />
      <page pageid="1436" ns="0" title="Notes from VRM" />
      <page pageid="1484" ns="0" title="Personal Address Manager Service" />
      <page pageid="1496" ns="12" title="Help:Cheatsheet" />
      <page pageid="1502" ns="0" title="Relbutton Scenarios" />
      <page pageid="1548" ns="0" title="R-button Functional Specification" />
      <page pageid="1550" ns="0" title="R-button" />
      <page pageid="1692" ns="0" title="VRM CRM 2010" />
      <page pageid="2150" ns="0" title="VRM History" />