waybar/protocol/dbus-status-notifier-watcher.xml

<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
  <interface name="org.kde.StatusNotifierWatcher">
    <annotation name="org.gtk.GDBus.C.Name" value="Watcher" />

    <!-- methods -->
    <method name="RegisterStatusNotifierItem">
      <annotation name="org.gtk.GDBus.C.Name" value="RegisterItem" />
      <arg name="service" type="s" direction="in"/>
    </method>

    <method name="RegisterStatusNotifierHost">
        <annotation name="org.gtk.GDBus.C.Name" value="RegisterHost" />
        <arg name="service" type="s" direction="in"/>
    </method>


    <!-- properties -->

    <property name="RegisteredStatusNotifierItems" type="as" access="read">
      <annotation name="org.gtk.GDBus.C.Name" value="RegisteredItems" />
      <annotation name="org.qtproject.QtDBus.QtTypeName.Out0" value="QStringList"/>
    </property>

    <property name="IsStatusNotifierHostRegistered" type="b" access="read">
      <annotation name="org.gtk.GDBus.C.Name" value="IsHostRegistered" />
    </property>

    <property name="ProtocolVersion" type="i" access="read"/>


    <!-- signals -->

    <signal name="StatusNotifierItemRegistered">
      <annotation name="org.gtk.GDBus.C.Name" value="ItemRegistered" />
      <arg type="s" direction="out" name="service" />
    </signal>

    <signal name="StatusNotifierItemUnregistered">
      <annotation name="org.gtk.GDBus.C.Name" value="ItemUnregistered" />
      <arg type="s" direction="out" name="service" />
    </signal>

    <signal name="StatusNotifierHostRegistered">
      <annotation name="org.gtk.GDBus.C.Name" value="HostRegistered" />
    </signal>

    <signal name="StatusNotifierHostUnregistered">
      <annotation name="org.gtk.GDBus.C.Name" value="HostUnregistered" />
    </signal>
  </interface>
</node>