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diff --git a/qlparser/qtunaryfunc.hh b/qlparser/qtunaryfunc.hh
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+++ b/qlparser/qtunaryfunc.hh
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+#ifndef _QTUNARYFUNC_HH__
+#define _QTUNARYFUNC_HH___
+
+#include "qlparser/qtunaryoperation.hh"
+
+// forward declarations
+class QtOperation;
+
+/*
+* 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 represenst a function returning the lower bound of an interval.
+
+*/
+
+class QtIntervalLoOp : public QtUnaryOperation
+{
+  public:
+    /// constructor getting operand
+    QtIntervalLoOp( QtOperation* newInput );
+
+    /// evaluates 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;
+
+    /// type checking of the subtree
+    virtual const QtTypeElement& checkType( QtTypeTuple* typeTuple = NULL );
+
+  private:
+    /// attribute for identification of nodes
+    static const QtNodeType nodeType;
+};
+
+
+
+
+
+//@ManMemo: Module: {\bf qlparser}
+
+/*@Doc:
+
+  The class represenst a function returning the higher bound of an interval.
+
+*/
+
+class QtIntervalHiOp : public QtUnaryOperation
+{
+  public:
+    /// constructor getting operand
+    QtIntervalHiOp( QtOperation* newInput );
+
+    /// evaluates 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;
+
+    /// type checking of the subtree
+    virtual const QtTypeElement& checkType( QtTypeTuple* typeTuple = NULL );
+
+  private:
+    /// attribute for identification of nodes
+    static const QtNodeType nodeType;
+};
+
+
+
+
+//@ManMemo: Module: {\bf qlparser}
+
+/*@Doc:
+
+  The class represenst a function returning the spatial domain of an mdd object.
+
+*/
+
+class QtSDom : public QtUnaryOperation
+{
+  public:
+    /// constructor getting operand
+    QtSDom( QtOperation* newInput );
+
+    /// evaluates the node
+    QtData* evaluate( QtDataList* inputList );
+
+    /// optimizing load access
+    virtual void optimizeLoad( QtTrimList* trimList );
+    /**
+      The method deletes the given {\tt trimList} and passes the {\tt optimizeLoad}
+      message with empty triming list to its operand tree.
+
+      Optimization process enters a new MDD area.
+    */
+
+    /// 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;
+
+    /// type checking 
+    virtual const QtTypeElement& checkType( QtTypeTuple* typeTuple = NULL );
+
+  private:
+    /// attribute for identification of nodes
+    static const QtNodeType nodeType;
+};
+
+
+#include "qlparser/qtunaryfunc.icc"
+
+#endif
+