This file is indexed.

/usr/share/xscreensaver/config/imsmap.xml is in xscreensaver-data-extra 5.15-3ubuntu1.

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="imsmap" _label="IMSMap">

  <command arg="-root"/>

  <number id="delay2" type="slider" arg="-delay2 %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="20000"
          convert="invert"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Linger" _low-label="1 Second" _high-label="1 Minute"
          low="1" high="60" default="5"/>

  <number id="iterations" type="slider" arg="-iterations %"
          _label="Density" _low-label="Sparse" _high-label="Dense"
          low="1" high="7" default="7"/>

  <number id="ncolors" type="slider" arg="-ncolors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="1" high="255" default="50"/>

  <select id="mode">
    <option id="random" _label="Random coloration"/>
    <option id="h"      _label="Hue gradients" arg-set="-mode h"/>
    <option id="s"      _label="Saturation gradients" arg-set="-mode s"/>
    <option id="v"      _label="Brightness gradients" arg-set="-mode v"/>
  </select>

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

  <_description>
This generates random cloud-like patterns.  The idea is to take four
points on the edge of the image, and assign each a random "elevation".
Then find the point between them, and give it a value which is the
average of the other four, plus some small random offset. 
Coloration is done based on elevation.

Written by Juergen Nickelsen and Jamie Zawinski; 1992.
  </_description>
</screensaver>