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diff --git a/raslib/flatbasetype.hh b/raslib/flatbasetype.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>.
+/
+/**
+ * INCLUDE: flatbasetype.hh
+ *
+ * MODULE:  raslib
+ * CLASS:   r_Flat_Base_Type
+ *
+ * COMMENTS:
+ *
+*/
+
+#ifndef _FLAT_BASE_TYPE_HH_
+#define _FLAT_BASE_TYPE_HH_
+
+#include <iostream>
+
+#include "raslib/error.hh"
+
+class r_Base_Type;
+class r_Primitive_Type;
+class r_Structure_Type;
+
+//@ManMemo: Module {\bf raslib}
+
+
+/*@Doc:
+  This class can be used to get a more convenient view on a structured
+  base type. It eliminates all hierarchies and gives you the primitive
+  types only which can be iterated over with a normal linear loop. Used
+  in e.g. the compression module. Note that this is not a regular member
+  of the r_Type hierarchy!
+*/
+
+class r_Flat_Base_Type
+{
+  public:
+  /// default constructor, shouldn't be used
+  r_Flat_Base_Type( void );
+  /// constructor receiving the (hierarchical) base type
+  r_Flat_Base_Type( const r_Base_Type *type );
+  /// copy constructor
+  r_Flat_Base_Type( const r_Flat_Base_Type &src );
+  /// destructor
+  ~r_Flat_Base_Type( void );
+
+  /// return number of primitive types
+  unsigned int get_num_types( void ) const;
+  /// return pointer to primitive type num
+  /// index violation is thrown if higher index is requested than available
+  const r_Primitive_Type *type( unsigned int num ) const throw (r_Eindex_violation);
+  /// operator returns pointer to primitive type num or NULL if invalid
+  /// index violation is thrown if higher index is requested than available
+  const r_Primitive_Type *operator[]( unsigned int num ) const throw (r_Eindex_violation);
+  /// return offset of primitive type num
+  /// index violation is thrown if higher index is requested than available
+  unsigned int offset( unsigned int num ) const throw (r_Eindex_violation);
+  /// return size of entire type
+  r_Bytes size( void ) const;
+  /// assignment of another flat type
+  r_Flat_Base_Type &operator=( const r_Flat_Base_Type &src );
+  /// assignment of a base type
+  r_Flat_Base_Type &operator=( const r_Base_Type *type );
+  /// equality
+  bool operator==( const r_Flat_Base_Type &src ) const;
+  /// print status to a stream
+  void print_status( std::ostream &str ) const;
+
+
+  protected:
+  /// shared init code
+  void init_shared( void );
+  /// process a base type
+  void process_type( const r_Base_Type *type );
+  /// copy another flat type
+  void copy_flat_type( const r_Flat_Base_Type &type );
+  /// free type-specific data (destructor, assignment)
+  void free_type_data( void );
+
+  /// parse a structure type and return number of primitive types contained therein
+  unsigned int parse_structure_type( const r_Structure_Type *type, unsigned int number,
+				     unsigned int offset );
+  /// parse a primitive type
+  void parse_primitive_type( r_Primitive_Type *type, unsigned int number,
+			     unsigned int offset );
+
+  /// the number of primitive types
+  unsigned int numPrimTypes;
+  /// the total size of the entire type
+  r_Bytes typeSize;
+  /// the primitive types
+  r_Primitive_Type **primTypes;
+  /// the corresponding offsets
+  unsigned int *offsets;
+};
+
+
+//@ManMemo: Module {\bf raslib}
+
+//@Doc: write the status of a flat base type to a stream
+extern std::ostream &operator<<( std::ostream &str, const r_Flat_Base_Type &type );
+
+#endif