mutter-performance-source/src/mutter.schemas.in

<gconfschemafile>
  <schemalist>

    <!-- General preferences -->        

    <schema>
      <key>/schemas/apps/mutter/general/overlay_key</key>
      <applyto>/apps/mutter/general/overlay_key</applyto>
      <owner>mutter</owner>
      <type>string</type>
      <default>Super_L</default>
      <locale name="C">
         <short>Modifier to use for extended window management operations</short>
         <long>
			This key will initiate the "overlay", which is a combination window
			overview and application launching system.  The default is intended
			to be the "Windows key" on PC hardware.

			It's expected that this binding either the default or set to 
			the empty string.
         </long>
      </locale>
    </schema>

    <schema>
      <key>/schemas/apps/mutter/general/clutter_plugins</key>
      <applyto>/apps/mutter/general/clutter_plugins</applyto>
      <owner>mutter</owner>
      <type>list</type>
      <list_type>string</list_type>
      <default>[default]</default>
      <locale name="C">
        <short>Clutter Plugins</short>
        <long>
          Plugins to load for the Clutter-based compositing manager.
        </long>
      </locale>
    </schema>

    <schema>
      <key>/schemas/apps/mutter/general/live_hidden_windows</key>
      <applyto>/apps/mutter/general/live_hidden_windows</applyto>
      <owner>mutter</owner>
      <type>bool</type>
      <default>false</default>
      <locale name="C">
        <short>Live Hidden Windows</short>
        <long>
          Determines whether hidden windows (i.e., minimized windows and
          windows on other workspaces than the current one) should be kept
          alive.
        </long>
      </locale>
    </schema>
  </schemalist>  
</gconfschemafile>