This file is indexed.

/usr/share/xscreensaver/config/lattice.xml is in rss-glx 0.9.1-5ubuntu2.

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="lattice" _label="Lattice">

  <command arg="-r"/>

  <number id="02" type="spinbutton" arg="-l %"
          _label="Longitudinal divisions of tori" low="4" high="100" default="16"/>

  <number id="03" type="spinbutton" arg="-L %"
          _label="Latitudinal divisions of tori" low="2" high="100" default="8"/>

  <select id="04">
    <option id="04A" _label="Material - Default"/>
    <option id="04B" _label="Material - none" arg-set="-T 0"/>
    <option id="04C" _label="Material - Industrial" arg-set="-T 1"/>
    <option id="04D" _label="Material - Crystal" arg-set="-T 2"/>
    <option id="04E" _label="Material - Chrome" arg-set="-T 3"/>
    <option id="04F" _label="Material - Brass" arg-set="-T 4"/>
    <option id="04G" _label="Material - Shiny" arg-set="-T 5"/>
    <option id="04H" _label="Material - Ghostly" arg-set="-T 6"/>
    <option id="04I" _label="Material - Circuits" arg-set="-T 7"/>
    <option id="04J" _label="Material - Doughnuts" arg-set="-T 8"/>
    <option id="04K" _label="Material - random" arg-set="-T 9"/>
  </select>

  <number id="05" type="slider" arg="-t %"
          _label="Thickness of tori" _low-label="Smaller" _high-label="Larger"
          low="1" high="100" default="50"/>

  <number id="06" type="slider" arg="-d %"
          _label="Density" _low-label="Less" _high-label="More"
          low="1" high="100" default="50"/>

  <number id="07" type="slider" arg="-D %"
          _label="Depth" _low-label="Less" _high-label="More"
          low="1" high="8" default="4"/>

  <number id="08" type="slider" arg="-o %"
          _label="Field of view" _low-label="Less" _high-label="More"
          low="10" high="150" default="90"/>

  <number id="09" type="slider" arg="-P %"
          _label="Randomness of camera path" _low-label="Slower" _high-label="Faster"
          low="1" high="10" default="7"/>

  <number id="10" type="slider" arg="-e %"
          _label="Speed" _low-label="Slower" _high-label="Faster"
          low="1" high="100" default="10"/>

  <boolean id="11" _label="Smooth shading" arg-set="-s"/>
  <boolean id="12" _label="Enable fog" arg-set="-f"/>

  <select id="01">
    <option id="01A" _label="Preset - Custom"/>
    <option id="01B" _label="Preset - Regular" arg-set="-p 1"/>
    <option id="01C" _label="Preset - Chainmail" arg-set="-p 2"/>
    <option id="01D" _label="Preset - Brash Mesh" arg-set="-p 3"/>
    <option id="01E" _label="Preset - Computer" arg-set="-p 4"/>
    <option id="01F" _label="Preset - Slick" arg-set="-p 5"/>
    <option id="01G" _label="Preset - Tasty" arg-set="-p 6"/>
  </select>

  <_description>
Flying through a lattice.

Note: Presets override all other settings. If you wish to customize the other options, make sure the preset option is set to "Preset - Custom".

Written by Terry Welsh &lt;mogumbo at totalmail.com&gt;.
Ported to Linux by Tugrul Galatali - &lt;http://rss-glx.sourceforge.net/&gt;.
Config Files by Curtis Haas.
  </_description>
</screensaver>