/usr/share/help/C/system-admin-guide/backgrounds-extra.page is in gnome-user-guide 3.8.2-1.
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type="topic" style="task"
id="backgrounds-extra">
<info>
<revision version="0.1" date="2012-07-02" status="draft"/>
<link type="guide" xref="index" group="appearance" />
<credit type="author copyright">
<name>Matthias Clasen</name>
<email>matthias.clasen@gmail.com</email>
<years>2012</years>
</credit>
<credit type="editor">
<name>Jana Svarova</name>
<email>jana.svarova@gmail.com</email>
<years>2013</years>
</credit>
<desc>How do I make extra backgrounds available to my users?</desc>
</info>
<title>Extra backgrounds</title>
<p>You can make extra backgrounds available to users on your system.</p>
<p>To do so, install an XML file describing your extra backgrounds in the
<file>/usr/share/gnome-background-properties/</file> directory. Below is a
simple example:</p>
<code><![CDATA[
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
<wallpapers>
<wallpaper deleted="false">
<name>Company Background</name>
<name xml:lang="de">Firmenhintergrund</name>
<filename>/usr/local/share/backgrounds/company-wallpaper.jpg</filename>
<options>zoom</options>
<shade_type>solid</shade_type>
<pcolor>#ffffff</pcolor>
<scolor>#000000</scolor>
</wallpaper>
</wallpapers>
]]></code>
<section id="backgrounds-extra-two-wallpapers">
<title>Add multiple backgrounds</title>
<p>In one configuration file, it is possible to add multiple backgrounds
by adding more <wallpaper> elements.</p>
<p>See the following example which shows an XML file with two
<wallpaper> elements</p>
<code><![CDATA[
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
<wallpapers>
<wallpaper deleted="false">
<name>Company Background</name>
<name xml:lang="de">Firmenhintergrund</name>
<filename>/usr/local/share/backgrounds/company-wallpaper.jpg</filename>
<options>zoom</options>
<shade_type>solid</shade_type>
<pcolor>#ffffff</pcolor>
<scolor>#000000</scolor>
</wallpaper>
<wallpaper deleted="false">
<name>Company Background 2</name>
<name xml:lang="de">Firmenhintergrund 2</name>
<filename>/usr/local/share/backgrounds/company-wallpaper-2.jpg</filename>
<options>zoom</options>
<shade_type>solid</shade_type>
<pcolor>#ff0000</pcolor>
<scolor>#00ffff</scolor>
</wallpaper>
</wallpapers>
]]></code>
</section>
</page>
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