This file is indexed.

/usr/share/xscreensaver/config/barcode.xml is in xscreensaver-data-extra 5.15-2ubuntu1.

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="barcode" _label="Barcode">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="10000"
          convert="invert"/>

  <select id="mode">
    <option id="scroll"  _label="Scrolling barcodes"/>
    <option id="scroll"  _label="Barcode grid"            arg-set="-mode grid"/>
    <option id="clock12" _label="Barcode clock (AM/PM)"   arg-set="-mode clock12"/>
    <option id="clock24" _label="Barcode clock (24 hour)" arg-set="-mode clock24"/>
  </select>

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

  <_description>
Draws a random sequence of colorful barcodes scrolling across your
screen.  CONSUME!

The barcodes follow the UPC-A, UPC-E, EAN-8 or EAN-13 standards.

http://en.wikipedia.org/wiki/Universal_Product_Code
http://en.wikipedia.org/wiki/European_Article_Number

Written by Dan Bornstein; 2003.
  </_description>
</screensaver>