This file is indexed.

/usr/share/xscreensaver/config/carousel.xml is in xscreensaver-gl-extra 5.15-3ubuntu1.

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="carousel" _label="Carousel">

  <command arg="-root"/>

  <hgroup>
   <vgroup>

    <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="speed" type="slider" arg="-speed %"
            _label="Animation speed" _low-label="Slow" _high-label="Fast"
            low="0.1" high="8.0" default="1.0"/>

    <number id="duration" type="slider" arg="-duration %"
            _label="Time until loading a new image"
            _low-label="5 seconds" _high-label="1 minute"
            low="5" high="60" default="20"/>

   </vgroup>
   <vgroup>

    <number id="count" type="spinbutton" arg="-count %"
            _label="Number of images" low="1" high="20" default="7"/>

    <select id="mode">
      <option id="tiltxy"  _label="Tilt in/out and left/right"/>
      <option id="tiltx"   _label="Tilt in/out only"     arg-set="-tilt x"/>
      <option id="tilty"   _label="Tilt left/right only" arg-set="-tilt y"/>
      <option id="notilt"  _label="No tilting"           arg-set="-tilt 0"/>
    </select>

    <boolean id="zoom" _label="Zoom in/out" arg-unset="-no-zoom"/>
    <boolean id="titles" _label="Show file names" arg-unset="-no-titles"/>
    <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

   </vgroup>
  </hgroup>

  <xscreensaver-image />

  <_description>
Loads several random images, and displays them flying in a circular
formation.  The formation changes speed and direction randomly, and
images periodically drop out to be replaced by new ones.

Written by Jamie Zawinski; 2005.
  </_description>
</screensaver>