libnotify/docs/notification-spec.xml

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<article id="index">
 <articleinfo>
  <title>Desktop Notifications Specification</title>
  <releaseinfo>Version 0.3</releaseinfo>
  <date>28 August 2004</date>
  <authorgroup>
   <author>
    <firstname>Mike</firstname>
    <surname>Hearn</surname>
    <affiliation>
     <address>
      <email>mike@navi.cx</email>
     </address>
    </affiliation>
   </author>
   <author>
    <firstname>Christian</firstname>
    <surname>Hammond</surname>
    <affiliation>
     <address>
      <email>chipx86@chipx86.com</email>
     </address>
    </affiliation>
   </author>
  </authorgroup>
  <revhistory>
   <revision>
    <revnumber>0.3</revnumber>
    <date>28 August 2004</date>
    <authorinitials>cdh</authorinitials>
    <revremark>Added hint and notification type sections</revremark>
   </revision>
   <revision>
    <revnumber>0.2</revnumber>
    <date>foo</date>
    <authorinitials>mh</authorinitials>
    <revremark>Added replaces field to protocol</revremark>
   </revision>
   <revision>
    <revnumber>0.1</revnumber>
    <date>foo</date>
    <authorinitials>mh</authorinitials>
    <revremark>Initial version</revremark>
   </revision>
  </revhistory>
 </articleinfo>

 <sect1 id="introduction">
  <title>Introduction</title>
  <para>
   This is a draft standard for a desktop notifications service, through
   which applications can generate passive popups (sometimes known as
   "poptarts") to notify the user in an asynchronous manner of events.
  </para>
  <para>
   This specification explicitly does not include other types of
   notification presentation such as modal message boxes, window manager
   decorations or window list annotations.
  </para>
  <para>
   Example use cases include:
  </para>
  <itemizedlist>
   <listitem>
    <para>
     Presence changes in IM programs: for instance, MSN Messenger on
     Windows pioneered the use of passive popups to indicate presence
     changes.
    </para>
   </listitem>
   <listitem><para>Scheduled alarm</para></listitem>
   <listitem><para>Completed file transfer</para></listitem>
   <listitem><para>New mail notification</para></listitem>
   <listitem><para>Low disk space/battery warnings</para></listitem>
  </itemizedlist>
 </sect1>

 <sect1 id="basic-design">
  <title>Basic Design</title>
  <para>
   In order to ensure that multiple notifications can easily be
   displayed at once, and to provide a convenient implementation, all
   notifications are controlled by a single session-scoped service which
   exposes a D-BUS interface.
  </para>
  <para>
   On startup, a conforming implementation should take the
   <literal>org.freedesktop.Notifications</literal> service on
   the session bus. This service will be referred to as the "notification
   server" or just "the server" in this document. It can optionally be
   activated automatically by the bus process, however this is not required
   and notification server clients must not assume that it is available.
  </para>
  <para>
   The server should implement the
   <literal>org.freedesktop.Notifications</literal> interface on
   an object with the path "/org/freedesktop/Notifications". This is the
   only interface required by this version of the specification.
  </para>
  <para>
   A notification has the following components:
  </para>
  <table>
   <title>Notification Components</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Component</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody valign="top">
     <row>
      <entry>Application Name</entry>
      <entry>
       Application name: This is the optional name of the application sending
       the notification. This should be the application's formal name, rather
       than some sort of ID.
      </entry>
     </row>
     <row>
      <entry>Application Icon</entry>
      <entry>
       An optional byte array containing the application's icon.
       This should be in PNG or GIF formats.
      </entry>
     </row>
     <row>
      <entry>Application ID</entry>
      <entry>
       An optional byte array containing the application's icon.
       This should be in PNG or GIF formats.
      </entry>
     </row>
     <row>
      <entry>Replaces ID</entry>
      <entry>
       An optional ID of an existing notification that this
       notification is intended to replace.
      </entry>
     </row>
     <row>
      <entry>Notification Type ID</entry>
      <entry>
       An optional ID representing the notification type. See
       <xref linkend="notification-types"/>.
      </entry>
     </row>
     <row>
      <entry>Urgency Level</entry>
      <entry>
       The urgency of the notification. See <xref linkend="urgency-levels"/>.
      </entry>
     </row>
     <row>
      <entry>Summary</entry>
      <entry>
       This is a single line overview of the notification. For instance,
       "You have mail" or "A friend has come online". It should generally
       not be longer than 40 characters, though this is not a requirement,
       and server implementations should word wrap if necessary. The summary
       must be encoded using UTF-8.
      </entry>
     </row>
     <row>
      <entry>Body</entry>
      <entry>
       <para>
        This is a multi-line body of text. Each line is a paragraph, server
        implementations are free to word wrap them as they see fit.
       </para>
       <para>
        The text may contain simple markup as specified in
        <xref linkend="markup"/>. It must be encoded using UTF-8.
       </para>
       <para>
        If the body is omitted just the summary is displayed.
       </para>
      </entry>
     </row>
     <row>
      <entry>Images</entry>
      <entry>See <xref linkend="icons-sounds"/>.</entry>
     </row>
     <row>
      <entry>Sounds</entry>
      <entry>See <xref linkend="icons-sounds"/>.</entry>
     </row>
     <row>
      <entry>Actions</entry>
      <entry>
       The actions send a request message back to the notification client
       when invoked. This functionality may not be implemented by the
       notification server, conforming clients should check if it is available
       before using it (see the GetCapabilities message in
       <xref linkend="protocol"/>. An implementation is free to ignore any
       requested by the client. As an example one possible rendering of
       actions would be as buttons in the notification popup.
      </entry>
     </row>
     <row>
      <entry>Hints</entry>
      <entry>See <xref linkend="hints"/>.</entry>
     </row>
     <row>
      <entry>Expiration Time</entry>
      <entry>
       <para>
        The timestamp in seconds since the epoch that the notification should
        close. For example, if one wishes to have an expiration of 5 seconds
        from now, they must grab the current timestamp and add 5 seconds to it.
       </para>
       <para>
        If zero, the notification's expiration time is dependent on the
        notification server's settings, and may vary for the type of
        notification.
       </para>
       <para>
        The expiration time should be respected by implementations, but this is
        not required (this is for compatibility with KNotify).
       </para>
      </entry>
     </row>
    </tbody>
   </tgroup>
  </table>

  <para>
   Each notification displayed is allocated a unique ID by the server.
   This is unique within the session. While the notification server is
   running, the ID will not be recycled unless the capacity of a uint32 is
   exceeded.
  </para>
  <para>
   This can be used to hide the notification before the expiration time
   is reached. It can also be used to atomically replace the notification
   with another. This allows you to (for instance) modify the contents of
   a notification while it's on-screen.
  </para>
 </sect1>

 <sect1 id="backwards-compat" xreflabel="Backwards Compatibility">
  <title>Backwards Compatibility</title>
  <para>
   Clients should try and avoid making assumptions about the presentation and
   abilities of the notification server. The message content is the most
   important thing.
  </para>
  <para>
   Clients can check with the server what capabilities are supported
   using the GetCapabilities message. See <xref linkend="protocol"/>.
  </para>
  <para>
   If a client requires a response from a passive popup, it should be
   coded such that a non-focus-stealing message box can be used instead
   and the notification server is only used when available.
  </para>
 </sect1>

 <sect1 id="markup" xreflabel="Markup">
  <title>Markup</title>
  <para>
   Body text may contain markup. The markup is XML-based, and consists
   of a small subset of HTML along with a few additional tags.
  </para>
  <para>
   The following tags should be supported by the notification server.
   Though it is optional, it is recommended. Notification servers that do
   not support these tags should filter them out.
  </para>
  <informaltable>
   <tgroup cols="2">
    <tbody valign="top">
     <row>
      <entry>
       <sgmltag class="starttag">b</sgmltag> ...
       <sgmltag class="endtag">b</sgmltag>
      </entry>
      <entry>Bold</entry>
     </row>
     <row>
      <entry>
       <sgmltag class="starttag">i</sgmltag> ...
       <sgmltag class="endtag">i</sgmltag>
      </entry>
      <entry>Italic</entry>
     </row>
     <row>
      <entry>
       <sgmltag class="starttag">u</sgmltag> ...
       <sgmltag class="endtag">u</sgmltag>
      </entry>
      <entry>Underline</entry>
     </row>
     <row>
      <entry>
       <sgmltag class="starttag">a href="..."</sgmltag> ...
       <sgmltag class="endtag">a</sgmltag>
      </entry>
      <entry>Hyperlink</entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
  <para>
   <remark>
    What else do we want here? We're going to want more tags
    for sure.
   </remark>
  </para>
 </sect1>

 <sect1 id="icons-sounds" xreflabel="Icons and Sounds">
  <title>Icons and Sounds</title>
  <para>
   A notification can optionally include an array of images and/or a
   single sound. The array of images specifies frames in an animation,
   animations always loop. Implementations are free to ignore the
   images and sound data, and implementations that support images need not
   support animation.
  </para>
  <para>
   If the image array has more than one element, a "primary frame" can
   be specified - if not specified it defaults to the first frame. For
   implementations that support images but not animation (for instance a
   <application>KNotify</application> bridge), only the primary frame will
   be used.
  </para>
  <para>
   Each element of the array must have the same type as the first
   element, mixtures of strings and blobs are not allowed. The element
   types can be one of the following:
  </para>
  <informaltable>
   <tgroup cols="3">
    <thead>
     <row>
      <entry>Element</entry>
      <entry>Type</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody valign="top">
     <row>
      <entry>Icon Theme Name</entry>
      <entry>String</entry>
      <entry>
       Any string that does not begin with the <literal>/</literal>
       character is assumed to be an icon theme name and is looked up
       according to the spec. The best size to fit the servers chosen
       presentation will be used. This is the recommended way of specifying
       images.
      </entry>
     </row>
     <row>
      <entry>Absolute Path</entry>
      <entry>String</entry>
      <entry>
       Any string that begins with a <literal>/</literal> will be used as
       an absolute file path. Implementations should support at minimum
       files of type image/png and image/svg.
      </entry>
     </row>
     <row>
      <entry>Image Data</entry>
      <entry>Binary Data</entry>
      <entry>
       A data stream may be embedded in the message. This is assumed to be
       of type image/png.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
  <para>
   A sound can be specified, this will be played by the notification
   server when the notification is displayed.
   <remark>Elaborate here!</remark>
  </para>
 </sect1>

 <sect1 id="notification-types" xreflabel="Notification Types">
  <title>Notification Types</title>
  <para><remark>Write me!</remark></para>
 </sect1>

 <sect1 id="urgency-levels" xreflabel="Urgency Levels">
  <title>Urgency Levels</title>
  <para>
   Notifications have an urgency level associated with them. This defines
   the importance of the notification. For example, "Your computer is on
   fire" would be a critical urgency. "Joe Bob signed on" would be a low
   urgency.
  </para>
  <para>Urgency levels are defined as follows:</para>
  <table>
   <title>Urgency Levels</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Level</entry>
      <entry>Name</entry>
     </row>
    </thead>
    <tbody valign="top">
     <row>
      <entry>0</entry>
      <entry>Low</entry>
     </row>
     <row>
      <entry>1</entry>
      <entry>Medium (Normal)</entry>
     </row>
     <row>
      <entry>2</entry>
      <entry>High</entry>
     </row>
     <row>
      <entry>3</entry>
      <entry>Critical</entry>
     </row>
    </tbody>
   </tgroup>
  </table>
  <para>
   Developers must use their own judgement when deciding the urgency of a
   notification. Typically, if the majority of programs are using the same
   level for a specific type of urgency, other applications should follow
   them.
  </para>
  <para>
   Server implementations may use urgency information how they see fit.
   Possible implementations may keep critical notifications on the screen
   until the user manually closes them, which is our recommendation. However,
   there are no user interface guidelines in this area.
  </para>
 </sect1>

 <sect1 id="hints" xreflabel="Hints">
  <title>Hints</title>
  <para>
   Hints are a way to provide extra data to a notification server that
   the server may be able to make use of. Such examples may be the
   application's PID or the window ID.
  </para>
  <para>
   Neither clients nor notification servers are required to support any
   hints. Both sides should assume that hints are not passed, and should
   ignore any hints they do not understand.
  </para>
  <para>
   The following table lists the standard hints as defined by this
   specification. Future hints may be proposed and added to this list
   over time. Once again, implementations are not required to support these.
  </para>
  <table>
   <title>Standard Hints</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Name</entry>
      <entry>Value Type</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody valign="top">
     <row>
      <entry><literal>"pid"</literal></entry>
      <entry>UINT32</entry>
      <entry>
       The Process ID of the application that sent the notification.
      </entry>
     </row>
     <row>
      <entry><literal>"winid"</literal></entry>
      <entry>UINT32</entry>
      <entry>
       The Window ID that sent the notification. This may be used,
       for example, to flash the window.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </table>
  <para>
   Third parties, when defining their own hints, should discuss the
   possibilty of standardizing on the hint with other parties, preferably
   in a place such as the
   <ulink url="http://freedesktop.org/mailman/listinfo/xdg">xdg</ulink>
   mailing list at
   <ulink url="http://freedesktop.org/">freedesktop.org</ulink>. If it
   warrants a standard, it will be added to the table above. If no
   consensus is reached, the hint name should be in the form of
   <literal>"x-<replaceable>vendor</replaceable>-<replaceable>name</replaceable>."</literal>
  </para>
 </sect1>

 <sect1 id="protocol" xreflabel="Protocol">
  <title>D-BUS Protocol</title>
  <para>
   The following messages <emphasis>must</emphasis> be supported by all
   implementations.
  </para>

  <sect2 id="commands">
   <title>Message commands</title>

   <sect3 id="command-get-capabilities">
    <title><literal>org.freedesktop.Notifications.GetCapabilities</literal></title>
    <funcsynopsis>
     <funcprototype>
      <funcdef>STRING_ARRAY
       <function>org.freedesktop.Notifications.GetCapabilities</function>
      </funcdef>
      <void/>
     </funcprototype>
    </funcsynopsis>
    <para>
     This message takes no parameters.
    </para>
    <para>
     It returns an array of strings. Each string describes an optional
     capability implemented by the server. The following values are
     defined by this spec:
    </para>
    <table>
     <title>Server Capabilities</title>
     <tgroup cols="2">
      <tbody valign="top">
       <row>
        <entry><literal>"body"</literal></entry>
        <entry>
         Supports body text. Some implementations may only show the
         summary (for instance, onscreen displays, marquee/scrollers)
        </entry>
       </row>
       <row>
        <entry><literal>"markup"</literal></entry>
        <entry>
         Supports markup in the body text. If marked up text is sent
         to a server that does not give this cap, the markup will show
         through as regular text so must be stripped clientside.
        </entry>
       </row>
       <row>
        <entry><literal>"static-image"</literal></entry>
        <entry>
         Supports display of exactly 1 frame of any given image array.
         This value is mutually exclusive with
         <literal>"multi-image"</literal>, it is a protocol error for the
         server to specify both.
        </entry>
       </row>
       <row>
        <entry><literal>"multi-image"</literal></entry>
        <entry>
         The server will render an animation of all the frames in a given
         image array. The client may still specify multiple frames even if
         this cap and/or static-image is missing, however the server is
         free to ignore them and use only the primary frame.
        </entry>
       </row>
       <row>
        <entry><literal>"sound"</literal></entry>
        <entry>
         The server will play the specified sound. Even if this cap is
         missing, a sound may still be specified however the server is free
         to ignore it.
        </entry>
       </row>
       <row>
        <entry><literal>"actions"</literal></entry>
        <entry>
         The server will provide the specified actions to the user. Even if
         this cap is missing, actions may still be specified by the client,
         however the server is free to ignore them.
        </entry>
       </row>
      </tbody>
     </tgroup>
    </table>
    <para>
     New vendor-specific caps may be specified as long as they start with
     <literal>"x-<replaceable>vendor</replaceable>"</literal>. For instance,
     <literal>"x-gnome-foo-cap"</literal>. Capability names must not
     contain spaces. They are limited to alpha-numeric characters and dashes
     (<literal>"-"</literal>).
    </para>
   </sect3>

   <sect3 id="command-notify">
    <title><literal>org.freedesktop.Notifications.Notify</literal></title>
    <funcsynopsis>
     <funcprototype>
      <funcdef>UINT32
       <function>org.freedesktop.Notifications.Notify</function>
      </funcdef>
      <paramdef>STRING_OR_NIL <parameter>app_name</parameter></paramdef>
      <paramdef>BYTE_ARRAY_OR_NIL <parameter>app_icon</parameter></paramdef>
      <paramdef>UINT32_OR_NIL <parameter>replaces_id</parameter></paramdef>
      <paramdef>STRING_OR_NIL <parameter>notification_type</parameter></paramdef>
      <paramdef>BYTE <parameter>urgency_level</parameter></paramdef>
      <paramdef>STRING <parameter>summary</parameter></paramdef>
      <paramdef>STRING_OR_NIL <parameter>body</parameter></paramdef>
      <paramdef>ARRAY <parameter>images</parameter></paramdef>
      <paramdef>STRING_OR_NIL <parameter>sound</parameter></paramdef>
      <paramdef>DICT_OR_NIL <parameter>actions</parameter></paramdef>
      <paramdef>DICT_OR_NIL <parameter>hints</parameter></paramdef>
      <paramdef>UINT32_OR_NIL <parameter>expire_time</parameter></paramdef>
     </funcprototype>
    </funcsynopsis>
    <para>
     Sends a notification to the notification server.
    </para>
    <table>
     <title>Notify Parameters</title>
     <tgroup cols="3">
      <thead>
       <row>
        <entry>Name</entry>
        <entry>Type</entry>
        <entry>Description</entry>
       </row>
      </thead>
      <tbody valign="top">
       <row>
        <entry><parameter>app_name</parameter></entry>
        <entry>STRING or NIL</entry>
        <entry>
         The optional name of the application sending the notification.
        </entry>
       </row>
       <row>
        <entry><parameter>app_icon</parameter></entry>
        <entry>BYTE_ARRAY or NIL</entry>
        <entry>The optional program icon of the calling application.</entry>
       </row>
       <row>
        <entry><parameter>replaces_id</parameter></entry>
        <entry>UINT32 or NIL</entry>
        <entry>
         The optional notification ID that this notification replaces. The
         server must atomically (ie with no flicker or other visual cues)
         replace the given notification with this one. This allows clients to
         effectively modify the notification while it's active.
        </entry>
       </row>
       <row>
        <entry><parameter>notification_type</parameter></entry>
        <entry>STRING or NIL</entry>
        <entry>
         The optional notification type ID, for potential server
         categorization and logging purposes. See
         <xref linkend="notification-types"/>.
        </entry>
       </row>
       <row>
        <entry><parameter>urgency_level</parameter></entry>
        <entry>BYTE</entry>
        <entry>The urgency level. See <xref linkend="urgency-levels"/>.</entry>
       </row>
       <row>
        <entry><parameter>summary</parameter></entry>
        <entry>STRING</entry>
        <entry>The summary text briefly describing the notification.</entry>
       </row>
       <row>
        <entry><parameter>body</parameter></entry>
        <entry>STRING or NIL</entry>
        <entry>The optional detailed body text.</entry>
       </row>
       <row>
        <entry><parameter>images</parameter></entry>
        <entry>ARRAY or NIL</entry>
        <entry>
         The optional array of images. See <xref linkend="icons-sounds"/>.
        </entry>
       </row>
       <row>
        <entry><parameter>sound</parameter></entry>
        <entry>STRING</entry>
        <entry>The optional sound file to play.</entry>
       </row>
       <row>
        <entry><parameter>actions</parameter></entry>
        <entry>DICT or NIL</entry>
        <entry>
         A dictionary key of actions. Each key is the localized name of the
         action, as it should appear to the user, and maps to a UINT32 value
         containing a program-specific action code. This code will be reported
         back to the program if the action is invoked by the user.
        </entry>
       </row>
       <row>
        <entry><parameter>hints</parameter></entry>
        <entry>DICT or NIL</entry>
        <entry>
         Optional hints that can be passed to the server from the client
         program. Although clients and servers should never assume each other
         supports any specific hints, they can be used to pass along
         information, such as the process PID or window ID, that the server
         may be able to make use of. See <xref linkend="hints"/>.
        </entry>
       </row>
       <row>
        <entry><parameter>expire_time</parameter></entry>
        <entry>UINT32 or NIL</entry>
        <entry>
         The notification time-out time, represented as UNIX-time (seconds
         since the epoch). If this is NIL, the notification
         will never time out, and will only be closed when an action is
         invoked. If non-NIL, this will specify a time at which the notification
         will be automatically closed. If zero, the server's default
         expiration time will be used.
        </entry>
       </row>
      </tbody>
     </tgroup>
    </table>
    <para>
     If <parameter>replaces_id</parameter> is NIL, the return value is a
     UINT32 that represent the notification. It is unique, and will not be
     reused unless a <constant>MAXINT</constant> number of notifications
     have been generated. An acceptable implementation may just use an
     incrementing counter for the ID. The returned ID is always greater than
     zero. Servers must make sure not to return zero as an ID.
    </para>
    <para>
     If <parameter>replaces_id</parameter> is not NIL, the returned value
     is the same value as <parameter>replaces_id</parameter>.
    </para>
   </sect3>

   <sect3 id="command-close-notification">
    <title><literal>org.freedesktop.Notifications.CloseNotification</literal></title>
    <funcsynopsis>
     <funcprototype>
      <funcdef>BOOLEAN
       <function>org.freedesktop.Notifications.CloseNotification</function>
      </funcdef>
      <paramdef>UINT32 id</paramdef>
     </funcprototype>
    </funcsynopsis>
    <para>
     Causes a notification to be forcefully closed and removed from the user's
     view. It can be used, for example, in the event that what the
     notification pertains to is no onger relevant, or to cancel a
     notification with no expiration time.
    </para>
    <para>
     The <literal>NotificationClosed</literal> signal is emitted by this
     method.
    </para>
    <para>
     This returns <constant>TRUE</constant> if the notification was closed.
     If the notification didn't exist, this will return
     <constant>FALSE</constant>. This can happen if the notification already
     expired or was closed, or if the ID was simply invalid.
    </para>
   </sect3>

   <sect3 id="command-get-server-information">
    <title><literal>org.freedesktop.Notifications.GetServerInformation</literal></title>
    <funcsynopsis>
     <funcprototype>
      <funcdef>
       void
       <function>org.freedesktop.Notifications.GetServerInformation</function>
      </funcdef>
      <paramdef>out STRING <parameter>name</parameter></paramdef>
      <paramdef>out STRING <parameter>vendor</parameter></paramdef>
      <paramdef>out STRING <parameter>version</parameter></paramdef>
     </funcprototype>
    </funcsynopsis>
    <para>
     This message returns the information on the server. Specifically,
     the server name, vendor, and version number.
    </para>
    <table>
     <title>GetServerInformation Return Values</title>
     <tgroup cols="2">
      <thead>
       <row>
        <entry>Name</entry>
        <entry>Type</entry>
        <entry>Description</entry>
       </row>
      </thead>
      <tbody valign="top">
       <row>
        <entry><parameter>name</parameter></entry>
        <entry>STRING</entry>
        <entry>The product name of the server.</entry>
       </row>
       <row>
        <entry><parameter>vendor</parameter></entry>
        <entry>STRING</entry>
        <entry>
         The vendor name. For example, "KDE," "GNOME,"
         "freedesktop.org," or "Microsoft."
        </entry>
       </row>
       <row>
        <entry><parameter>version</parameter></entry>
        <entry>STRING</entry>
        <entry>The server's version number.</entry>
       </row>
      </tbody>
     </tgroup>
    </table>
   </sect3>
  </sect2>

  <sect2 id="signals">
   <title>Signals</title>

   <sect3 id="signal-notification-closed">
    <title><literal>org.freedesktop.Notifications.NotificationClosed</literal></title>
    <funcsynopsis>
     <funcprototype>
      <funcdef>
       <function>org.freedesktop.Notifications.NotificationClosed</function>
      </funcdef>
      <paramdef>UINT32 <parameter>id</parameter></paramdef>
      <paramdef>UINT32 <parameter>reason</parameter></paramdef>
     </funcprototype>
    </funcsynopsis>
    <para>
     A completed notification is one that has timed out, or has been
     dismissed by the user.
    </para>
    <table>
     <title>NotificationClosed Parameters</title>
     <tgroup cols="2">
      <thead>
       <row>
        <entry>Name</entry>
        <entry>Type</entry>
        <entry>Description</entry>
       </row>
      </thead>
      <tbody valign="top">
       <row>
        <entry><parameter>id</parameter></entry>
        <entry>UINT32</entry>
        <entry>The ID of the notification that was closed.</entry>
       </row>
       <row>
        <entry><parameter>reason</parameter></entry>
        <entry>UINT32</entry>
        <entry>
         <para>The reason the notification was closed.</para>
         <para>1 - The notification expired.</para>
         <para>2 - The notification was dismissed by the user.</para>
         <para>3 - The notification was closed by a call to
               <literal>CloseNotification</literal>.</para>
         <para>4 - Undefined/reserved reasons.</para>
        </entry>
       </row>
      </tbody>
     </tgroup>
    </table>
    <para>
     The ID specified in the signal is invalidated
     <emphasis>before</emphasis> the signal is sent and may not be used
     in any further communications with the server.
    </para>
   </sect3>

   <sect3 id="signal-action-invoked">
    <title><literal>org.freedesktop.Notifications.ActionInvoked</literal></title>
    <funcsynopsis>
     <funcprototype>
      <funcdef>
       <function>org.freedesktop.Notifications.ActionInvoked</function>
      </funcdef>
      <paramdef>UINT32 <parameter>id</parameter></paramdef>
<!--  <paramdef>BOOL <parameter>default_action</parameter></paramdef> -->
      <paramdef>UINT32 <parameter>action_id</parameter></paramdef>
     </funcprototype>
    </funcsynopsis>
    <para>
     This signal is emitted when one of the following occurs:
    </para>
    <itemizedlist>
     <listitem>
      <para>
       The user performs some global "invoking" action upon a notification.
       For instance, clicking somewhere on the notification itself.
      </para>
     </listitem>
     <listitem>
      <para>
       The user invokes a specific action as specified in the original
       Notify request. For example, clicking on an action button.
      </para>
     </listitem>
    </itemizedlist>
    <table>
     <title>ActionInvoked Parameters</title>
     <tgroup cols="2">
      <thead>
       <row>
        <entry>Name</entry>
        <entry>Type</entry>
        <entry>Description</entry>
       </row>
      </thead>
      <tbody valign="top">
       <row>
        <entry><parameter>id</parameter></entry>
        <entry>UINT32</entry>
        <entry>
         The ID of the notification emitting the ActionInvoked signal.
        </entry>
       </row>
<!--
       <row>
        <entry><parameter>default_action</parameter></entry>
        <entry>BOOL</entry>
        <entry>
         <constant>TRUE</constant> if the default action was invoked.
         The default action is often a click on the notification. If this
         is <constant>TRUE</constant>, the <parameter>action_id</parameter>
         parameter is ignored.
        </entry>
       </row>
-->
       <row>
        <entry><parameter>action_id</parameter></entry>
        <entry>UINT32</entry>
        <entry>
         The ID of the action invoked. A value of 0 means that the default
         action was invoked, i.e., clicking the notification itself.
         IDs greater than zero are the action IDs as defined by the
         calling application.
<!--
         This is ignored if
         <parameter>default_action</parameter> is <constant>TRUE</constant>.
-->
        </entry>
       </row>
      </tbody>
     </tgroup>
    </table>
    <note>
     <para>
      Clients should not assume the server will generate this signal. Some
      servers may not support user interaction at all, or may not support
      the concept of being able to "invoke" a notification.
     </para>
    </note>
   </sect3>
  </sect2>
 </sect1>
</article>