635
635
<a name="id-1.4.9.3.10.10.11"></a><h4>Returns</h4>
636
636
<p> the activation root of <em class="parameter"><code>volume</code></em>
637
or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. Use <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a> to free. </p>
638
638
<p><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
640
640
<p class="since">Since 2.18</p>