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diff --git a/src/Persistence_representations/concept/Real_valued_topological_data.h b/src/Persistence_representations/concept/Real_valued_topological_data.h
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author(s):       Pawel Dlotko
+ *
+ *    Copyright (C) 2015  INRIA (France)
+ *
+ *    This program 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.
+ *
+ *    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** \brief The concept Real_valued_topological_data describes the requirements 
+  * for a type to implement a container that allows computations of its projections to R. 
+  */
+class Real_valued_topological_data
+{
+public:
+	/**
+	 * Typically there are various ways data can be projected to R. This function give us the number of functions for vectorization provided by a given class. 
+	**/ 
+	 size_t number_of_projections_to_R();
+	   /**
+     * This is a function to compute the projection from this container to reals. The parameter of a function have to be between 0 and the value returned by number_of_projections_to_R().
+    **/ 
+     double project_to_R( size_t number_of_projection );
+};
+