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

<plugin>
  <name>jack</name>
  <description>Jack elements</description>
  <filename>../../ext/jack/.libs/libgstjack.so</filename>
  <basename>libgstjack.so</basename>
  <version>0.10.5.1</version>
  <license>LGPL</license>
  <source>gst-plugins-bad</source>
  <package>Gstreamer</package>
  <origin>http://gstreamer.freedesktop.org</origin>
  <elements>
    <element>
      <name>jackaudiosink</name>
      <longname>Audio Sink (Jack)</longname>
      <class>Sink/Audio</class>
      <description>Output to Jack</description>
      <author>Wim Taymans &lt;wim@fluendo.com&gt;</author>
      <pads>
        <caps>
          <name>sink</name>
          <direction>sink</direction>
          <presence>always</presence>
          <details>audio/x-raw-float, endianness=(int){ 1234 }, width=(int)32, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</details>
        </caps>
      </pads>
    </element>
  </elements>
</plugin>