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="Blackpool-Rd-A4-poster-v5.jpg|3471" />
      <page pageid="1570" ns="0" title="Visions for Peckham" />
      <page pageid="1623" ns="0" title="Peckham Rye Station" />
      <page pageid="1910" ns="0" title="Benny O&#039;Looney" />
      <page pageid="2068" ns="0" title="Transforming Central Rye Lane" />
      <page pageid="2163" ns="0" title="Old Waiting Room" />
      <page pageid="2166" ns="0" title="Peckham Rye Station/station forecourt" />
      <page pageid="2659" ns="0" title="Peckham Rye Station stages" />
      <page pageid="3588" ns="0" title="RoadTraffic" />