gnome-shell/data/dbus-interfaces/org.freedesktop.Notifications.xml

<node>
  <interface name="org.freedesktop.Notifications">
    <method name="Notify">
      <arg type="s" direction="in"/>
      <arg type="u" direction="in"/>
      <arg type="s" direction="in"/>
      <arg type="s" direction="in"/>
      <arg type="s" direction="in"/>
      <arg type="as" direction="in"/>
      <arg type="a{sv}" direction="in"/>
      <arg type="i" direction="in"/>
      <arg type="u" direction="out"/>
    </method>
    <method name="CloseNotification">
      <arg type="u" direction="in"/>
    </method>
    <method name="GetCapabilities">
      <arg type="as" direction="out"/>
    </method>
    <method name="GetServerInformation">
      <arg type="s" direction="out"/>
      <arg type="s" direction="out"/>
      <arg type="s" direction="out"/>
      <arg type="s" direction="out"/>
    </method>
    <signal name="NotificationClosed">
      <arg type="u"/>
      <arg type="u"/>
    </signal>
    <signal name="ActionInvoked">
      <arg type="u"/>
      <arg type="s"/>
    </signal>
    <signal name="ActivationToken">
      <arg type="u"/>
      <arg type="s"/>
    </signal>
  </interface>
</node>