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/usr/share/compiz/notification.xml is in compiz-plugins 1:0.9.13.1+18.04.20180302-0ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<compiz>
    <plugin useBcop="true" name="notification">
	<short>Notification</short>
	<long>Use libnotify to graphically display error messages</long>
	<category>Utility</category>
	<deps>
	    <relation type="after">
		<plugin>composite</plugin>
		<plugin>opengl</plugin>
		<plugin>place</plugin>
	    </relation>
	</deps>
	<options>
	    <option type="int" name="timeout">
		<short>Hide Timeout</short>
		<long>Timeout (in seconds) before hiding the notification, set to -1 for system default and 0 for indefinite</long>
		<min>-1</min>
		<max>30</max>
		<default>-1</default>
	    </option>
	    <option type="int" name="max_log_level">
		<short>Maximum Log Level</short>
		<long>The maximum log level to display</long>
		<default>1</default>
		<desc>
		    <value>0</value>
		    <name>Fatal</name>
		</desc>
		<desc>
		    <value>1</value>
		    <name>Error</name>
		</desc>
		<desc>
		    <value>2</value>
		    <name>Warning</name>
		</desc>
		<desc>
		    <value>3</value>
		    <name>Info</name>
		</desc>
		<desc>
		    <value>4</value>
		    <name>Debug</name>
		</desc>
	    </option>
	</options>
    </plugin>
</compiz>