This file is indexed.

/usr/share/xscreensaver/config/xspirograph.xml is in xscreensaver-data-extra 5.30-1+deb8u2.

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="xspirograph" _label="XSpirograph">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-subdelay %"
          _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="layers" type="spinbutton" arg="-layers %"
          _label="Layers" low="1" high="10" default="2"/>

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

  <xscreensaver-updater />

  <_description>
Simulates that pen-in-nested-plastic-gears toy from your childhood.

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

Written by Rohit Singh; 2000.
  </_description>
</screensaver>