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/usr/share/compiz/shelf.xml is in compiz-plugins-extra 0.9.7.0~bzr9-0ubuntu6.

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<?xml version="1.0"?>
<compiz>
  <plugin name="shelf" useBcop="true">
    <short>Shelf</short>
    <long>Visually scales a window down to allow easy monitoring without true/traditional resizing.  </long>
    <category>Window Management</category>
    <deps>
	<requirement>
	    <plugin>opengl</plugin>
	</requirement>
	<relation type="after">
	    <plugin>composite</plugin>
	    <plugin>opengl</plugin>
	    <plugin>wall</plugin>
	    <plugin>decor</plugin>
	</relation>
    </deps>
    <options>
      <group>
        <short>Bindings</short>
        <option name="trigger_key" type="key">
          <short>Trigger scale down</short>
          <long> Scale a window down to a portion of it's size.  </long>
          <default>&lt;Super&gt;l</default>
        </option>
	<option name="reset_key" type="key">
	  <short>Reset the window to original size</short>
	  <long>Resets the currently focused window to original size</long>
	</option>
        <option name="triggerscreen_key" type="key">
          <short>Trigger scale down to screen</short>
          <long> Scale a window down to a ration of the screen size. Respectively half, a third or a sixth of the screen.</long>
          <default>&lt;Super&gt;p</default>
        </option>
        <option name="dec_button" type="button">
          <short>Make the window smaller</short>
          <long> Reduces the scale factor making the window smaller.  </long>
          <default>&lt;Alt&gt;&lt;Super&gt;Button4</default>
        </option>
        <option name="inc_button" type="button">
          <short>Make the window bigger</short>
          <long> Increase the scale factor making the window bigger.  </long>
          <default>&lt;Alt&gt;&lt;Super&gt;Button5</default>
        </option>
      </group>
      <option name="animtime" type="int">
       <short>Animation duration</short>
       <long> Duration of the animation in milliseconds. </long>
       <default>150</default>
       <min>1</min>
       <max>10000</max>
      </option>
      <option name="interval" type="float">
       <short>Scale interval</short>
       <long> The number to divide the scale factor by or multiply it with when (respectively) increasing and decreasing the scale level manually.  Higher number means finer changes.  </long>
       <default>0.9</default>
       <min>0.100</min>
       <max>0.999</max>
       <precision>0.001</precision>
      </option>
    </options>
  </plugin>
</compiz>