This file is indexed.

/usr/share/xscreensaver/config/halo.xml is in xscreensaver-data-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="halo" _label="Halo">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="200000" default="100000"
          convert="invert"/>

  <number id="count" type="slider" arg="-count %"
          _label="Number of circles" _low-label="Few" _high-label="Many"
           low="0" high="20" default="0"/>

  <number id="ncolors" type="slider" arg="-colors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="1" high="255" default="100"/>

  <select id="mode">
    <option id="random"   _label="Random mode"/>
    <option id="seuss"    _label="Seuss mode" arg-set="-mode seuss"/>
    <option id="ramp"     _label="Ramp mode"  arg-set="-mode ramp"/>
  </select>

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

  <_description>
Draws trippy psychedelic circular patterns that hurt to look at.

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

Written by Jamie Zawinski; 1993.
  </_description>
</screensaver>