labwc/docs/menu.xml

<?xml version="1.0" encoding="UTF-8"?>

<openbox_menu>

<menu id="root-menu" label="">
  <item label="Web browser">
    <action name="Execute"><command>firefox</command></action>
  </item>
  <item label="Terminal">
    <action name="Execute"><command>alacritty</command></action>
  </item>
  <item label="Reconfigure">
    <action name="Reconfigure"></action>
  </item>
  <item label="Exit">
    <action name="Exit"></action>
  </item>
  <item label="Poweroff">
    <action name="Execute"><command>systemctl -i poweroff</command></action>
  </item>
</menu>

</openbox_menu>