This file is indexed.

/usr/share/xscreensaver/config/demon.xml is in xscreensaver-data-extra 5.15-2ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="demon" _label="Demon">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="50000"
          convert="invert"/>

  <number id="count" type="slider" arg="-count %"
          _label="States" _low-label="0" _high-label="20"
           low="0" high="20" default="0"/>

  <number id="cycles" type="slider" arg="-cycles %"
           _label="Timeout" _low-label="Small" _high-label="Large"
          low="0" high="800000" default="1000"/>

  <number id="ncolors" type="slider" arg="-ncolors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="1" high="255" default="64"/>

  <number id="size" type="spinbutton" arg="-size %"
           _label="Cell size" low="-20" high="20" default="-7"/>

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
A cellular automaton that starts with a random field, and organizes
it into stripes and spirals.

http://en.wikipedia.org/wiki/Maxwell%27s_demon

Written by David Bagley; 1999.
  </_description>
</screensaver>