plugin.xml

<library path="src">
  <class name="Launch Tree" type="rqt_launchtree.launchtree_plugin.LaunchtreePlugin" 
         base_class_type="rqt_gui_py::Plugin">
    <description>
      An RQT plugin for hierarchical launchfile configuration introspection.
    </description>
    <qtgui>
      <group>
        <label>Configuration</label>
        <icon type="theme">folder</icon>
        <statustip>Plugins related to configuration.</statustip>
      </group>
      <label>Launch Tree</label>
      <icon type="theme">format-indent-more</icon>
      <statustip>An RQT plugin for hierarchical launchfile configuration introspection.</statustip>
    </qtgui>
  </class>
</library>