This file is indexed.

/usr/share/xscreensaver/config/xlyap.xml is in xscreensaver-data 5.36-1ubuntu1.

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="xlyap" _label="XLyap">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=5MrEaXnhEPg"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="10000"
          convert="invert"/>

  <number id="linger" type="slider" arg="-linger %"
          _label="Linger" _low-label="Brief" _high-label="Long"
          low="0" high="10" default="5" />

  <!-- #### -builtin [-1] -->
  <!-- #### -C [1] -->
  <!-- #### -D [50] -->
  <!-- #### -L -->
  <!-- #### -M [1.0] -->
  <!-- #### -O [0] -->
  <!-- #### -R [] -->
  <!-- #### -S [50] -->
  <!-- #### -a [2.0] -->
  <!-- #### -b [2.0] -->
  <!-- #### -c [7] -->
  <!-- #### -F [10101010] -->
  <!-- #### -f [abbabaab] -->
  <!-- #### -h [] -->
  <!-- #### -i [0.65] -->
  <!-- #### -m [] -->
  <!-- #### -o [] -->
  <!-- #### -p -->
  <!-- #### -r [65000] -->
  <!-- #### -s [256] -->
  <!-- #### -v -->
  <!-- #### -w [] -->

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

  <xscreensaver-updater />

  <_description>
The Lyapunov exponent makes pretty fractal pictures.

https://en.wikipedia.org/wiki/Lyapunov_exponent

Written by Ron Record; 1997.
  </_description>
</screensaver>