gstreamer/docs/plugins/inspect/plugin-volume.xml

<plugin>
  <name>volume</name>
  <description>element for controlling audio volume</description>
  <filename>../../gst/volume/.libs/libgstvolume.so</filename>
  <basename>libgstvolume.so</basename>
  <version>0.9.4</version>
  <license>LGPL</license>
  <source>gst-plugins-base</source>
  <package>GStreamer Base Plug-ins source release</package>
  <origin>Unknown package origin</origin>
  <elements>
    <element>
      <name>volume</name>
      <longname>Volume</longname>
      <class>Filter/Effect/Audio</class>
      <description>Set volume on audio/raw streams</description>
      <author>Andy Wingo &lt;wingo@pobox.com&gt;</author>
    </element>
  </elements>
</plugin>