This file is indexed.

/usr/share/gnome-background-properties/debian-lines.xml is in desktop-base 9.0.2+deb9u1.

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="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
<wallpapers>
  <wallpaper>
    <!-- don't include words such as "wallpaper" (avoids translations) -->
    <name>Lines</name>
    <filename>/usr/share/desktop-base/lines-theme/wallpaper/gnome-background.xml</filename>
    <options>zoom</options>
    <pcolor>#ffffff</pcolor>
    <scolor>#000000</scolor>
  </wallpaper>
  <wallpaper>
    <!-- don't include words such as "wallpaper" (avoids translations) -->
    <name>Lines Lock Screen</name>
    <filename>/usr/share/desktop-base/lines-theme/lockscreen/gnome-background.xml</filename>
    <options>zoom</options>
    <pcolor>#ffffff</pcolor>
    <scolor>#000000</scolor>
  </wallpaper>
</wallpapers>