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diff --git a/libkcal/customproperties.h b/libkcal/customproperties.h
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+++ b/libkcal/customproperties.h
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+/*
+    This file is part of libkcal.
+    Copyright (c) 2002 David Jarvie <software@astrojar.org.uk>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+*/
+
+#ifndef KCAL_CUSTOM_PROPERTIES_H
+#define KCAL_CUSTOM_PROPERTIES_H
+
+#include <qstring.h>
+#include <qmap.h>
+
+namespace KCal {
+
+/**
+  This class represents custom calendar properties.
+  It is used as a base class for classes which represent calendar components.
+  A custom property name written by libkcal has the form X-KDE-APP-KEY where
+  APP represents the application name, and KEY distinguishes individual
+  properties for the application.
+  In keeping with RFC2445, property names must be composed only of the
+  characters A-Z, a-z, 0-9 and '-'.
+*/
+class CustomProperties
+{
+  public:
+    /** Construct a new empty custom properties instance */
+    CustomProperties();
+    CustomProperties(const CustomProperties &);
+    ~CustomProperties();
+
+    /** Create or modify a custom calendar property.
+      @param app Application name as it appears in the custom property name.
+      @param key Property identifier specific to the application.
+      @param value The property's value. A call with a value of QString::null
+      will be ignored.
+     */
+    void setCustomProperty(const QCString &app, const QCString &key,
+                           const QString &value);
+    /** Delete a custom calendar property.
+      @param app Application name as it appears in the custom property name.
+      @param key Property identifier specific to the application.
+     */
+    void removeCustomProperty(const QCString &app, const QCString &key);
+    /** Return the value of a custom calendar property.
+      @param app Application name as it appears in the custom property name.
+      @param key Property identifier specific to the application.
+      @return Property value, or QString::null if (and only if) the property does not exist.
+     */
+    QString customProperty(const QCString &app, const QCString &key) const;
+
+    /** Create or modify a non-KDE or non-standard custom calendar property.
+      @param name Full property name
+      @param value The property's value. A call with a value of QString::null
+      will be ignored.
+     */
+    void setNonKDECustomProperty(const QCString &name, const QString &value);
+    /** Delete a non-KDE or non-standard custom calendar property.
+      @param name Full property name
+     */
+    void removeNonKDECustomProperty(const QCString &name);
+    /** Return the value of a non-KDE or non-standard custom calendar property.
+      @param name Full property name
+      @return Property value, or QString::null if (and only if) the property does not exist.
+     */
+    QString nonKDECustomProperty(const QCString& name) const;
+
+    /** Initialise the alarm's custom calendar properties to the specified
+        key/value pairs.
+     */
+    void setCustomProperties(const QMap<QCString, QString> &properties);
+    /** Return all custom calendar property key/value pairs. */
+    QMap<QCString, QString> customProperties() const;
+
+  private:
+    static bool checkName(const QCString& name);
+
+    QMap<QCString, QString> mProperties;   // custom calendar properties
+};
+
+}
+
+#endif