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"?>
      <f fromid="1" ns="6" title="File:Indigoigloo 600.png" />
      <f fromid="21" ns="6" title="File:UNav Board-3D Render Top.png" />
      <f fromid="28" ns="6" title="File:UNav ICD programming.jpg" />
      <f fromid="6" ns="6" title="File:UNav board prototype zero vs coin.jpg" />
      <f fromid="1" ns="6" title="File:UNav logo 800.png" />
      <f fromid="21" ns="6" title="File:UNav logo 800.png" />