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diff --git a/qlparser/qtiterator.hh b/qlparser/qtiterator.hh
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+/*
+* 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>.
+*/
+#ifndef _QTITERATOR_
+#define _QTITERATOR_
+
+#include "qlparser/qtoncstream.hh"
+
+#include <vector>
+
+/*************************************************************
+ *
+ *
+ * COMMENTS:
+ *
+ ************************************************************/
+
+//@ManMemo: Module: {\bf qlparser}
+
+/*@Doc:
+
+It is super class for every class capable of iterating over collections of MDD.
+It has a list of inputs of type QtONCStream, so every instance of type
+QtONCStream or of a subtype of it can serve as an input stream for a QtIterator
+object. The input streams can be combined differently, as cross product of the
+inputs in class QtSelectionIterator or as simple tupels in the order they occure
+in the input streams in class QtOperationIterator.
+
+*/
+
+class QtIterator : public QtONCStream
+{
+  public:
+    /// list of QtONCStream objects
+    typedef std::vector<QtONCStream*> QtONCStreamList;
+
+    /// default constructor
+    QtIterator();
+
+    /// constructor getting a pointer to the parent
+    QtIterator( QtNode* node );
+
+    /// destructor
+    virtual ~QtIterator();
+
+    /// return childs of the node
+    virtual QtNodeList* getChilds( QtChildType flag );
+
+    /// 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: Operations of the ONC protocol
+    //@{
+    ///
+    virtual void open();
+    ///
+    virtual void close();
+    ///
+    virtual void reset();
+    //@}
+
+    //@Man: Read/Write methods:
+    //@{
+    ///
+    inline void setStreamInputs( QtONCStreamList* inputs );
+
+	/// Returns inputs
+	QtONCStreamList* getStreamInputs();
+    /// exchange the stream input {\tt oldInput} with {\tt newInput}
+    void setStreamInput( QtONCStream* oldInput, QtONCStream* newInput );
+    ///
+    //inline virtual void setParents();
+    //@}
+
+    /// pre optimization
+    //virtual void preOptimize();
+    /**
+       Pre-Optimization step is passed to the input streams.
+    */
+
+    /// get input type tuple
+    void getInputTypeTuple( QtTypeTuple& typeTuple );
+
+  protected:
+    /// list of input streams
+    QtONCStreamList* inputs;
+
+  private:
+	/// atribute for identification of nodes
+	static const QtNodeType nodeType;	
+};
+
+#include "qlparser/qtiterator.icc"
+
+#endif
+