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diff --git a/qlparser/qtconst.hh b/qlparser/qtconst.hh
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+#ifndef _QTCONST_
+#define _QTCONST_
+
+#ifndef CPPSTDLIB
+#include <ospace/string.h> // STL<ToolKit>
+#else
+#include <string>
+#endif
+
+#include "qlparser/qtdata.hh"
+#include "qlparser/qtoperation.hh"
+#include <stdio.h>
+
+/*
+* 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 a carrier for a {\tt QtData} object
+ and, additionally, provides functionality necessary in 
+ the query tree.
+
+*/
+
+class QtConst : public QtOperation
+{
+  public:
+    /// constructor getting a pointer to the data object 
+    QtConst( QtData* newDataObj );
+    /**
+      Lifetime of {\tt newDataObj} is managed by this class from now on.
+    */
+    
+    /// virtual destructor
+    virtual ~QtConst();
+
+    /// test if the two nodes have an equal meaning in the query tree
+    virtual bool equalMeaning( QtNode* node );
+
+    /// creates a unique name for a common subexpression
+    virtual std::string getSpelling();
+
+    /// test if the edge to the parent node is of type mdd or atomic
+    virtual QtAreaType getAreaType();
+
+    /// optimizing load access
+    virtual void optimizeLoad( QtTrimList* trimList );
+
+    /// method for evaluating the node
+    QtData* evaluate( QtDataList* inputList );
+
+    /// prints the tree 
+    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 );
+
+    /// method for identification of nodes
+    inline virtual const QtNodeType getNodeType() const;
+
+    //@Man: Operations of the ONC protocol:
+    //@{
+    ///
+    QtDataList* next();
+    //@}
+
+    //@Man: Read/Write methods:
+    //@{
+    ///
+      /// return the data object
+      inline QtData* getDataObj();
+    ///
+    //@}
+
+    /// type checking of the subtree
+    virtual const QtTypeElement& checkType( QtTypeTuple* typeTuple = NULL );
+
+  private:
+    /// pointer to the data object
+    QtData* dataObj;
+
+    /// attribute for identification of nodes
+    static const QtNodeType nodeType;
+};
+
+#include "qlparser/qtconst.icc"
+
+#endif
+