This file is indexed.

/usr/share/xscreensaver/config/celtic.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="celtic" _label="Celtic">

  <command arg="-root"/>

  <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="delay2" type="slider" arg="-delay2 %"
          _label="Linger" _low-label="Short" _high-label="Long"
          low="0" high="10" default="5"/>

  <boolean id="graph" _label="Draw graph" arg-set="-graph"/>

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

  <_description>
Repeatedly draws random Celtic cross-stitch patterns.

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

Written by Max Froumentin; 2005.
  </_description>
</screensaver>