The definition of plugin_description.xml is given as follows:
<library path="lib/librviz_telop_commander">
<class name="rviz_telop_commander/Teleop"
type="rviz_telop_commander::TeleopPanel"
base_class_type="rviz::Panel">
<description>
A panel widget allowing simple diff-drive style robot base control.
</description>
</class>
</library>