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/usr/share/compiz/session.xml is in compiz-plugins-default 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="session">
	<short>Session Management</short>
	<long>Talk to session manager and save/load window state</long>
	<category>Utility</category>
	<deps>
	    <relation type="after">
		<plugin>composite</plugin>
		<plugin>opengl</plugin>
		<plugin>place</plugin>
		<plugin>decor</plugin>
	    </relation>
	</deps>
	<options>
	    <option type="bool" name="save_legacy">
		<short>Save Legacy Apps</short>
		<long>Also try to save and restore legacy apps that don't support the X session management protocol. This setting only should be used in KDE, as only KDE's session manager also saves those applications.</long>
		<default>false</default>
	    </option>
	    <option type="match" name="ignore_match">
	    	<short>Windows to ignore</short>
	    	<long>Matching windows will not be handled by the session plugin</long>
    		<default/>
            </option>
	</options>
    </plugin>
</compiz>