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diff --git a/qlparser/qtoperationiterator.hh b/qlparser/qtoperationiterator.hh
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+#ifndef _QTOPERATIONITERATOR_
+#define _QTOPERATIONITERATOR_
+
+#ifndef CPPSTDLIB
+#include <ospace/string.h> // STL<ToolKit>
+#else
+#include <string>
+#endif
+
+#include "qlparser/qtiterator.hh"
+#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:
+
+A QtOperationIterator takes the next element of its input streams an creates
+a tupel out of them. The operation specified through an operation tree of type
+QtOperation is evaluated for this tupel and the result is passed to its output
+stream. The class stands for the SELECT part of a query. The operations in the
+SELECT clause are expressed through an operation tree which is attached to this
+class.
+
+*/
+
+class QtOperationIterator : public QtIterator
+{
+  public:
+    /// default constructor
+    QtOperationIterator();
+
+    /// constructor getting a pointer to the parent
+    QtOperationIterator( QtNode* node );
+
+    /// virtual destructor
+    virtual ~QtOperationIterator();
+
+    /// return childs of the node
+    virtual QtNodeList* getChilds( QtChildType flag );
+
+    /// method for query rewrite
+    inline virtual void setInput( QtOperation* child, QtOperation* input);
+
+    /// optimizing load access
+    //virtual void preOptimize();
+    /**
+      Trigger load optimization in the operation tree and pass the optimization step to 
+      the input streams.
+    */
+
+    /// 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 );
+
+    //@Man: Read/Write methods:
+    //@{
+    ///
+    //inline virtual void setParents();
+    ///
+    inline void setOperationTree( QtOperation* operation );
+    ///
+    inline QtNode::QtOperationList* getOperationTreeList();
+    //@}
+
+    //@Man: Operations of the ONC protocol:
+    //@{
+    ///
+    QtDataList* next();
+    //@}
+
+    /// method for identification of nodes
+    inline virtual const QtNodeType getNodeType() const;
+
+    /// type checking
+    virtual const QtTypeTuple& checkType();
+
+  private:
+    /// operation trees
+    QtOperationList* operationTreeList;
+
+    /// attribute for identification of nodes
+    static const QtNodeType nodeType;
+};
+
+#include "qlparser/qtoperationiterator.icc"
+
+#endif
+