This file is indexed.

/usr/share/xscreensaver/config/moire.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="moire" _label="Moire">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Duration" _low-label="1 second" _high-label="1 minute"
          low="1" high="60" default="5"/>

  <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="offset" type="slider" arg="-offset %"
            _label="Offset" _low-label="Small" _high-label="Large"
            low="1" high="200" default="50"/>

  <!-- #### -no-random -->

<!--  <boolean id="shm" _label="Use shared memory" arg-unset="-no-shm"/> -->

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

  <_description>
  When the lines on the screen
  Make more lines in between,
  That's a moire'!

http://en.wikipedia.org/wiki/Moire_pattern

Written by Jamie Zawinski and Michael Bayne; 1997.
  </_description>
</screensaver>