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diff --git a/qlparser/qtscalardata.hh b/qlparser/qtscalardata.hh
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+#ifndef _QTSCALARDATA_HH_
+#define _QTSCALARDATA_HH_
+
+#ifndef CPPSTDLIB
+#include <ospace/string.h> // STL<ToolKit>
+#else
+#include <string>
+#endif
+
+#include "qlparser/qtdata.hh"
+#include "catalogmgr/typefactory.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 abstract class represents a scalar data handled by the
+ query tree. It can either be atomic (\Ref{QtAtomicData})
+ or complex (\Ref{QtComplexData}). 
+
+*/
+
+class QtScalarData : public QtData
+{
+  public:
+    /// default constructor
+    QtScalarData();
+
+    /// copy constructor
+    QtScalarData( const QtScalarData& obj );
+ 
+    /// virtual destructor
+    virtual ~QtScalarData();
+
+    //@Man: Read/Write methods:
+    //@{
+    ///
+
+      /// returns data type
+      virtual QtDataType getDataType() const;
+
+      /// returns true meaning that the data is of type scalar
+      virtual bool isScalarData() const;
+
+      /// returns a pointer to the value type
+      inline const BaseType* getValueType() const;
+
+      /// sets the value type
+      inline void setValueType( const BaseType* newType );
+
+      /// returns a pointer to the internal character representation
+      inline const char* getValueBuffer() const;
+
+      /// sets the value buffer
+      inline void setValueBuffer( char* buffer );
+
+      /// returns a null-terminated string describing the type structure
+      virtual char* getTypeStructure() const;
+      /**
+        The string pointer has to be free using free() by the caller.
+      */
+
+    ///
+    //@}
+
+    /// compares data content
+    virtual bool equal( const QtData* obj ) const;
+
+    /// returns content dependent string representation 
+    virtual std::string getSpelling() const;
+
+    /// print status of the object to the specified stream
+    virtual void printStatus( std::ostream& stream = std::cout ) const;
+
+  protected:
+    /// pointer to the value type
+    const BaseType* valueType;
+
+    /// pointer to the value buffer
+    char* valueBuffer; 
+};
+
+#include "qlparser/qtscalardata.icc"
+
+#endif
+
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