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diff --git a/reladminif/transactionif.hh b/reladminif/transactionif.hh
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+#ifndef _TRANSACTIONIF_HH_
+#define _TRANSACTIONIF_HH_
+
+/*
+* This file is part of rasdaman community.
+*
+* Rasdaman community is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* Rasdaman community 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 General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
+rasdaman GmbH.
+*
+* For more information please see <http://www.rasdaman.org>
+* or contact Peter Baumann via <baumann@rasdaman.com>.
+*/
+/************************************************************************
+ *
+ *
+ * PURPOSE:
+ *   
+ *
+ * COMMENTS:
+ *
+ ***********************************************************************/
+
+//@ManMemo: Module: {\bf transactionif}.
+
+/*@Doc:
+TransactionIf has the functionality to begin, commit and abort a base
+DBMS transaction.
+*/
+
+class TransactionIf;
+class DatabaseIf;
+
+#include <iostream>
+
+#include "raslib/error.hh"
+
+class TransactionIf              
+	{
+	public:
+		void begin(DatabaseIf* currBase, bool readOnly = false) throw ( r_Error );
+		/*@Doc: 
+		begin a TA.
+		By default, the TA started is a write TA. If {\tt readOnly} is set to 1, 
+		the TA will be read only.
+		*/
+
+		void commit() throw ( r_Error );
+		/*@Doc: 
+		commit a transaction.  make all changes permanent.
+		r_Error is thrown when any objects have problems
+		writting themselves to the database.
+		AdminIf::compCompTiles(), TypeFactory::freeTempTypes,
+		ObjectBroker::clearBroker, OId::deinitialize are called.
+		COMMIT is issued.  the database is closed.
+		the benchmark timers are stopped.
+		*/
+		
+		void abort();
+		/*@Doc: 
+		abort a TA.  don't make changes permanent.
+		AdminIf::compCompTiles(), TypeFactory::freeTempTypes,
+		ObjectBroker::clearBroker, OId::deinitialize are called.
+		ROLLBACK is issued.  the database is closed.
+		the benchmark timers are stopped.
+		*/
+		
+		DatabaseIf* getDatabaseIf();
+		/*@Doc: 
+		returns the DatabaseIf object associated with this transaction.
+		*/
+		
+	private:
+		void begin( bool readOnly = false ) throw ( r_Error );
+		/*@Doc: 
+		begin a TA. Internal usage only.
+		This function does not work if the appropriate initializations have'nt 
+		been done. For that reason, it is only appropriate for internal usage.
+		By default, the TA started is a write TA. If {\tt readOnly} is set to 1, 
+		the TA will be read only. 
+		benchmark timers are started.
+		*/
+		
+		bool isReadOnly;
+		/*@Doc: 
+		keeps track if the current TA is read only or not
+		*/
+		
+		static DatabaseIf* lastBase;
+		/*@Doc: 
+		stores the last base used in begin();
+		*/
+	};
+
+#endif