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diff --git a/qlparser/qtnaryoperation.hh b/qlparser/qtnaryoperation.hh
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+++ b/qlparser/qtnaryoperation.hh
@@ -0,0 +1,137 @@
+#ifndef _QTNARYOPERATION_
+#define _QTNARYOPERATION_
+
+#ifndef CPPSTDLIB
+#include <ospace/string.h> // STL<ToolKit>
+#else
+#include <string>
+#endif
+
+#include <stdio.h>
+
+#include "qlparser/qtoperation.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>.
+*/
+/**************************************************************
+ *
+ *
+ * COMMENTS:
+ *
+ ************************************************************/
+
+//@ManMemo: Module: {\bf qlparser}
+
+/*@Doc:
+
+  The class serves as superclass for all operation classes taking n
+  (more than two) arguments.
+
+*/
+
+class QtNaryOperation : public QtOperation
+{
+  public:
+    /// default constructor
+    QtNaryOperation();
+
+    /// constructor getting the node to the parent
+    QtNaryOperation( QtNode* node );
+
+    /// constructor getting a list of operands
+    QtNaryOperation( QtOperationList* opList );
+
+    /// virtual destructor
+    virtual ~QtNaryOperation();
+
+    /// simplifies the tree 
+    virtual void simplify();
+
+    /// test if the two nodes have an equal meaning in the query tree
+    virtual bool equalMeaning( QtNode* node );
+    /**
+      The meaning of a binary operation is equal, iff all operands have
+      the same meaning.
+    */
+
+    /// return childs of the node
+    virtual QtNodeList* getChilds( QtChildType flag );
+
+    /// creates a unique name for a subexpression
+    virtual std::string getSpelling();
+
+    /// method for query rewrite
+    virtual void setInput( QtOperation*, QtOperation* inputNew );
+
+    /// tests if the edge to the parent node is of type mdd or atomic
+    virtual QtAreaType getAreaType();
+
+    /// method for checking idempotency rules
+//    virtual void checkIdempotency();
+
+    /// optimizing load access
+    virtual void optimizeLoad( QtTrimList* trimList );
+    /**
+      The method deletes the given {\tt trimList} and passes the {\tt optimizeLoad}
+      message with empty triming lists to its input trees.
+    */
+
+    /// debugging method
+    virtual void printTree( int tab, std::ostream& s = std::cout, QtChildType mode = QT_ALL_NODES );
+
+    /// prints the algebraic expression
+    virtual void printAlgebraicExpression( std::ostream& s = std::cout );
+
+    //@Man: read/write methods for the operands
+    //@{
+    ///
+      ///
+      inline void                     setInputs( QtOperationList* opList );
+      ///
+      inline QtNode::QtOperationList* getInputs();
+    ///
+    //@}
+
+  protected:
+    /// method for testing and evaluating the input branches
+    bool getOperands( QtDataList* inputList, QtDataList* &operandList );
+    /**
+      The method checks if the input branches are valid. Then it passes the evaluate message to its two
+      operands with the {\tt inputList} as argument. The returned results are provided through the arguments
+      {\tt operand1} and {\tt operand2} called by reference. The method returns {\tt true} if the operands are
+      valid, otherwise {\tt false}.
+    */
+
+    /// operation trees
+    QtOperationList* operationList;
+
+  private:
+	/// atribute for identification of nodes
+	static const QtNodeType nodeType;
+};
+
+#include "qlparser/qtnaryoperation.icc"
+
+#endif
+
+