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-  <chapter id="calendar-architecture">
-    <title>Architecture of the Calendar</title>
-
-    <para>
-      This chapter gives an overview of the &Evolution; Calendar
-      architecture.  It describes the model/view split of the calendar
-      into a personal calendar server, or &PCS;, and the GUI clients
-      that appear inside the &Evolution; Shell.
-    </para>
-
-    <!-- Model/View Separation -->
-
-    <sect1 id="calendar-model-view">
-      <title>Model/View Separation</title>
-
-      <para>
-	Like other base components in &Evolution;, the calendar
-	separates the data model from the views or clients.  This is
-	done so that multiple clients can access the same calendar
-	data in an orderly fashion and without clashes.  For example,
-	the user may be running a graphical calendar client.  If he
-	then wants to synchronize his calendar with a handheld device,
-	then the corresponding synchronization program (e.g. a conduit
-	for the <application>gnome-pilot</application> package) will
-	also need to access the calendar storage.  It is important
-	that both the GUI client and the synchronization program keep
-	a consistent view of the calendar at all times, otherwise one
-	of them will be left in an inconsistent state if the
-	calendar's data changes unexpectedly.
-      </para>
-
-      <para>
-	&Evolution; puts the calendar storage in a daemon called the
-	&Wombat; and completely separates it from clients who wants to
-	access calendar data.  This part of the &Wombat; is called the
-	personal calendar server, or &PCS;.  Clients must contact the
-	&PCS; and ask it to open an existing calendar or create a new
-	one.  When a calendar component object (e.g. an appointment or
-	to-do item) changes in the &PCS; it will notify all the
-	clients that are using the component's parent calendar.
-      </para>
-    </sect1>
-
-    <!-- Personal Calendar Server -->
-
-    <sect1>
-      <title>Personal Calendar Server</title>
-
-      <para>
-	The personal calendar server, or &PCS;, provides centralized
-	management and storage of a user's personal calendar.
-	Multiple clients can connect to the &PCS; simultaneously to
-	query and modify the user's calendar in a synchronized
-	fashion.  The main features of the &PCS; are as follows:
-      </para>
-
-      <formalpara>
-	<title>Storage</title>
-
-	<para>
-	  The &PCS; is responsible for loading and saving calendars.
-	  Centralizing the loading and saving functionality allows
-	  multiple clients to use the same calendar at the same time
-	  without having to worry about each other.
-	</para>
-      </formalpara>
-
-      <formalpara>
-	<title>Basic Queries</title>
-
-	<para>
-	  The &PCS; provides functions to do basic queries on a
-	  calendar, for example, a client can ask the server for a
-	  list of all the appointments in the calendar, or for all the
-	  data for a specific appointment.
-	</para>
-      </formalpara>
-
-      <formalpara>
-	<title>Recurrence and Alarm Queries</title>
-
-	<para>
-	  Looking for the events that recur or have alarm triggers in
-	  a specific period of time involves scanning all the
-	  appointments in a calendar.  To keep clients from having to
-	  load whole calendars at once, the &PCS; can do these
-	  computations and send the results to clients.
-	</para>
-      </formalpara>
-
-      <formalpara>
-	<title>Modification Log</title>
-
-	<para>
-	  To allow multiple handheld devices to be synchronized
-	  against a calendar, the &PCS; keeps a log of all the
-	  modifications that are done to the calendar.  When an
-	  appointment is updated or removed, the &PCS; logs this
-	  action in the modification log.  Synchronization conduit
-	  programs can then use this information to do their work.
-	</para>
-      </formalpara>
-    </sect1>
-
-    <!-- Data Views -->
-
-    <sect1>
-      <title>Data Views</title>
-
-      <para>
-	&Evolution; provides a graphical calendar client inside the
-	shell that is just a view onto the data stored in the personal
-	calendar server.  You can launch as many views of a calendar
-	as you like and they will all receive notification from the
-	&PCS; when changes occur.  The views are then responsible for
-	updating their respective displays.
-      </para>
-
-      <para>
-	Even within a single calendar view in the &Evolution; shell
-	there can be multiple clients of a single calendar.  For
-	example, in the day view of the &Evolution; calendar there are
-	three widgets that act as three different clients of the
-	&PCS;:  the multi-day view, the busy days calendar, and the
-	task list.
-      </para>
-    </sect1>
-
-    <!-- Non-graphical Clients -->
-
-    <sect1>
-      <title>Non-graphical Clients</title>
-
-      <para>
-	Clients of the personal calendar server can be non-graphical,
-	that is, they do not have to provide views of the data to the
-	user.  Examples of such clients are the synchronization
-	conduit programs for handheld devices.  These usually run with
-	no user interface as a result of being invoked by a daemon
-	that watches the connection to a handheld device.  For
-	example, the calendar synchronization conduit in &Evolution;
-	gets run when the <application>gpilotd</application> daemon
-	from the <application>gnome-pilot</application> package
-	detects that the HotSync button has been pressed on a Palm
-	Pilot device.
-      </para>
-
-      <para>
-	Such clients simply take advantage of the centralized storage
-	in the &PCS; without presenting any graphical display of the
-	data; they just act as middlemen between the &PCS; and other
-	applications.
-      </para>
-    </sect1>
-  </chapter>
-
-<!--
-Local variables:
-mode: sgml
-sgml-parent-document: ("../evolution-devel-guide.sgml" "book" "part" "")
-End:
--->