This file is indexed.

/usr/share/xscreensaver/config/cage.xml is in xscreensaver-gl-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="cage" _label="Cage" gl="yes">

  <command arg="-root"/>

  <video href="http://www.youtube.com/watch?v=BxGHUFvI2Zo"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="25000"
          convert="invert"/>

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

  <xscreensaver-updater />

  <_description>
Escher's "Impossible Cage", a 3d analog of a moebius
strip, and rotates it in three dimensions.

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

Written by Marcelo Vianna; 1998.
  </_description>
</screensaver>