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"?>
    <allimages gaicontinue="Sheetfeed_scanner_papers.JPG" />
      <page pageid="26" ns="6" title="File:1280px-Christian science church122908 02.jpg" />
      <page pageid="29" ns="6" title="File:Archivist-1.jpg" />
      <page pageid="2" ns="6" title="File:AsciiGlobe.gif" />
      <page pageid="12" ns="6" title="File:Dctf.jpg" />
      <page pageid="11" ns="6" title="File:Disks.jpg" />
      <page pageid="16" ns="6" title="File:Flatbed scanner book.JPG" />
      <page pageid="15" ns="6" title="File:Flatbed scanner empty.JPG" />
      <page pageid="13" ns="6" title="File:Kf features.jpg" />
      <page pageid="30" ns="6" title="File:Knightlore.png" />
      <page pageid="17" ns="6" title="File:Sheetfeed scanner empty.JPG" />