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-<!doctype article PUBLIC "-//Davenport//DTD DocBook V3.0//EN" [
-<!entity Evolution "<application>Evolution</application>">
-<!entity CUA "<acronym>CUA</acronym>">
-<!entity PCS "<acronym>PCS</acronym>">
-<!entity Bonobo "<application>Bonobo</application>">
-<!entity CORBA "<acronym>CORBA</acronym>">
-<!entity GTK "<acronym>GTK+</acronym>">
-]>
-
-<article class="whitepaper" id="calendar">
-
-  <artheader>
-    <title>&Evolution; Calendaring Framework</title>
-
-    <authorgroup>
-      <author>
-	<firstname>Federico</firstname>
-	<surname>Mena Quintero</surname>
-	<affiliation>
-	  <address>
-	    <email>federico@helixcode.com</email>
-	  </address>
-	</affiliation>
-      </author>
-    </authorgroup>
-
-    <copyright>
-      <year>2000</year>
-      <holder>Helix Code, Inc.</holder>
-    </copyright>
-
-    <abstract>
-      <para>
-	The &Evolution; groupware suite provides a framework for
-	developing calendaring applications, as well as a graphical
-	calendar client and a personal calendar server.  This white
-	paper describes the architecture of the &Evolution;
-	calendaring framework.
-      </para>
-    </abstract>
-  </artheader>
-
-  <!-- Introduction -->
-
-  <sect1 id="introduction">
-    <title>Introduction</title>
-
-    <para>
-      Calendaring is an important part of a groupware suite.  A
-      calendaring framework will allow a user to keep a personal
-      calendar and have several applications use it.  Such
-      applications could be a graphical calendar client that the user
-      employs to schedule appointments and keep track of his time, a
-      <productname>Palm Pilot</productname> synchronization client, or
-      a simple alarm or reminder utility.  A comprehensive calendaring
-      framework will also allow multiple users to schedule
-      appointments between each other; for example, a project director
-      may want to schedule a weekly meeting with the rest of the
-      project members, or a person who owns a large house may want to
-      schedule a big party with his friends.  The attendees will then
-      want to reply with messages such as, &ldquo;I will
-      attend&rdquo;, or &ldquo;I will attend only if the proposed time
-      is changed&rdquo;.
-    </para>
-
-    <para>
-      The &Evolution; groupware suite provides a framework for
-      developing calendaring applications, as well as a graphical
-      calendar client or calendar user agent (&CUA;) and a personal
-      calendar server (&PCS;).
-    </para>
-
-    <para>
-      The following sections explain the basic calendaring framework,
-      the functions of the calendar user agent and the personal
-      calendar server, and the relationship between the two.
-    </para>
-  </sect1>
-
-  <!-- Personal Calendar Server -->
-
-  <sect1 id="pcs">
-    <title>Personal Calendar Server</title>
-
-    <para>
-      The personal calendar server (&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>
-	Clients can ask the &PCS; for a list of the appointments that
-	occur within a specified time range; for example a graphical
-	client that has a per-week view could ask the &PCS; for all
-	the appointments that occur in a particular week.  This
-	includes multiple occurrences of a single recurring event; for
-	example, the object for &ldquo;a 1-hour meeting that occurs on
-	every Tuesday and Thursday&rdquo; is represented inside the
-	&PCS; as a single event with a recurrence rule.  Similarly,
-	clients can ask the &PCS; for a list of events that have
-	alarms that trigger within a specified time range.
-      </para>
-    </formalpara>
-
-    <formalpara>
-      <title>Notification of Changes</title>
-
-      <para>
-	This is the most important function of the &PCS;, as it allows
-	multiple calendar clients to maintain a unified view of the
-	calendar between the server and themselves.  When a client
-	asks the &PCS; to modify or remove an event, the &PCS;
-	notifies all the clients that are connected to it about the
-	change.  The policy is that &ldquo;the server is always
-	right&rdquo;; clients can act as dumb views onto the
-	calendar's data and they will be notified by the &PCS; when
-	something changes.
-      </para>
-    </formalpara>
-  </sect1>
-
-  <!-- Calenar User Agent -->
-
-  <sect1 id="cua">
-    <title>Calendar User Agent</title>
-
-    <para>
-      A calendar user agent (&CUA;) is a program that lets a user
-      manipulate a calendar.  &Evolution; provides an attractive,
-      graphical calendar client that communicates with the &Evolution;
-      personal calendar server.
-    </para>
-
-    <para>
-      The &Evolution; calendar client just provides a view onto the
-      data that is stored and managed by the personal calendar server.
-      The calendar client does not perform direct manipulations on a
-      calendar's data; instead it offloads those requests to the
-      calendar server, which takes care of making the appropriate
-      modifications in the calendar and then notifies all the clients
-      about the changes.
-    </para>
-  </sect1>
-
-  <!-- Calendar Client Library -->
-
-  <sect1 id="client-lib">
-    <title>Calendar Client Library</title>
-
-    <para>
-      Communication between the personal calendar server and calendar
-      clients is defined by a set of &Bonobo; &CORBA; interfaces.
-      Clients can be written by implementing the client-side
-      <classname>Listener</classname> interface, which defines the
-      notification callbacks that the PCS uses to inform clients about
-      changes to the calendar.
-    </para>
-
-    <para>
-      As a convenience for &GTK; programmers, &Evolution; also
-      includes a library which provides a
-      <classname>CalClient</classname> class which can be used for
-      communication with the personal calendar server.  Objects of
-      this class automatically contact the PCS when they are created.
-      <classname>CalClient</classname> provides functions to request
-      changes in the calendar, and it also emits signals when it gets
-      notification about changes from the PCS.  This makes it easy and
-      convenient to write calendar clients for &Evolution; using
-      &GTK;.
-    </para>
-
-    <para>
-      The implementation of the <classname>CalClient</classname> class
-      simply wraps the &Evolution; &CORBA; interfaces for calendaring
-      with a familiar-looking &GTK; object.  Calls to the
-      <classname>Listener</classname> interface get translated to
-      signal emissions from the <classname>CalClient</classname>, thus
-      shielding programmers from the details of the &CORBA;
-      interfaces.
-    </para>
-  </sect1>
-</article>