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diff --git a/libkcal/calformat.h b/libkcal/calformat.h
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+/*
+    This file is part of libkcal.
+    Copyright (c) 2001 Cornelius Schumacher <schumacher@kde.org>
+
+    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 _CALFORMAT_H
+#define _CALFORMAT_H
+
+#include <qstring.h>
+#include <qdatetime.h>
+#include <qevent.h>
+
+#include "exceptions.h"
+#include "event.h"
+
+namespace KCal {
+
+class VCalDrag;
+class Calendar;
+
+/**
+  This is the base class for calendar formats. It provides an interface for the
+  generation/interpretation of a textual representation of a calendar.
+
+  @short Class providing in interface to a calendar format
+*/
+class CalFormat {
+  public:
+    /** Constructs a new format. */
+    CalFormat();
+    /** Destruct calendar format. */
+    virtual ~CalFormat();
+
+    /**
+      loads a calendar on disk into the calendar associated with this format.
+      Returns TRUE if successful,else returns FALSE.
+      @param fileName the name of the calendar on disk.
+    */
+    virtual bool load(Calendar *, const QString &fileName) = 0;
+    /** writes out the calendar to disk. Returns true if
+     * successful and false on error.
+     * @param fileName the name of the file
+     */
+    virtual bool save(Calendar *, const QString &fileName) = 0;
+
+    /**
+      Parse string and populate calendar with that information.
+    */
+    virtual bool fromString(Calendar *, const QString & ) = 0;
+    /**
+      Return calendar information as string.
+    */
+    virtual QString toString(Calendar *) = 0;
+
+    /** Clear exception status of this format object */
+    void clearException();
+    /**
+      Return exception, if there is any, containing information about the last
+      error that occured.
+    */
+    ErrorFormat *exception();
+
+    /** Set the application name for use in unique IDs and error messages,
+     *  and product ID for incidence PRODID property
+     */
+    static void setApplication(const QString& app, const QString& productID);
+    /** Return the application name used in unique IDs and error messages */
+    static const QString& application()  { return mApplication; }
+    /** Return the PRODID string to write into calendar files */
+    static const QString& productId()  { return mProductId; }
+    /** Return the KDE calendar format version indicated by a PRODID property */
+    static int calendarVersion(const char* prodId);
+    /** Return the PRODID string loaded from calendar file */
+    const QString &loadedProductId()  { return mLoadedProductId; }
+
+    /** Create a unique id string. */
+    static QString createUniqueId();
+
+    /**
+      Set exception for this object. This is used by the functions of this
+      class to report errors.
+    */
+    void setException(ErrorFormat *error);
+
+  protected:
+    QString mLoadedProductId;         // PRODID string loaded from calendar file
+
+  private:
+    ErrorFormat *mException;
+
+    static QString mApplication;      // name of application for unique ID strings
+    static QString mProductId;        // PRODID string to write to calendar files
+};
+
+}
+
+#endif