This file is indexed.

/usr/share/xscreensaver/config/sierpinski.xml is in xscreensaver-data-extra 5.34-2ubuntu1.

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="sierpinski" _label="Sierpinski">

  <command arg="-root"/>

  <video href="http://www.youtube.com/watch?v=m0zdPWuFhjA"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="1000000" default="400000"
          convert="invert"/>

  <number id="count" type="slider" arg="-count %"
          _label="Points" _low-label="Few" _high-label="Many"
           low="10" high="10000" default="2000"/>

  <number id="cycles" type="slider" arg="-cycles %"
           _label="Timeout" _low-label="Small" _high-label="Large"
          low="0" high="1000" default="100"/>

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

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

  <xscreensaver-updater />

  <_description>
The 2D Sierpinski triangle fractal.  See also the "Sierpinski3D" screen saver.

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

Written by Desmond Daignault; 1997.
  </_description>
</screensaver>