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diff --git a/libkcal/customproperties.h b/libkcal/customproperties.h
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+/*
+    This file is part of libkcal.
+
+    Copyright (c) 2002,2006 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., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef KCAL_CUSTOMPROPERTIES_H
+#define KCAL_CUSTOMPROPERTIES_H
+
+#include <qstring.h>
+#include <qmap.h>
+#include <kdepimmacros.h>
+
+#include "libkcal_export.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 LIBKCAL_EXPORT CustomProperties
+{
+  public:
+    /**
+      Construct a new empty custom properties instance.
+    */
+    CustomProperties();
+    CustomProperties( const CustomProperties & );
+    ~CustomProperties();
+
+    bool operator==( const CustomProperties & ) const;
+
+    /**
+      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;
+
+  protected:
+    /**
+      Called when a custom property has been changed.
+      The default implementation does nothing: override in derived classes
+      to perform change processing.
+    */
+    virtual void customPropertyUpdated()  {}
+
+  private:
+    static bool checkName(const QCString& name);
+
+    QMap<QCString, QString> mProperties;   // custom calendar properties
+
+    class Private;
+    Private *d;
+};
+
+}
+
+#endif