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diff --git a/src/Skeleton_blocker/concept/SkeletonBlockerGeometricDS.h b/src/Skeleton_blocker/concept/SkeletonBlockerGeometricDS.h
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+/*
+ * SkeletonBlockerGeometricDS.h
+ *
+ *  Created on: Feb 20, 2014 
+ *      Author: David Salinas
+ *  Copyright 2013 INRIA. All rights reserved
+ */
+
+#ifndef GUDHI_SKELETONBLOCKERGEOMETRICDS_H_
+#define GUDHI_SKELETONBLOCKERGEOMETRICDS_H_
+
+/** \brief Concept that must be passed to
+ * the template class Skeleton_blocker_geometric_complex
+ *
+ */
+template<typename GeometryTrait>
+struct SkeletonBlockerGeometricDS : public SkeletonBlockerDS
+{
+
+	/**
+	 * Geometry information.
+	 */
+	typedef GeometryTrait GT ;
+
+	/**
+	 * Type of point (should be the same as GT::Point).
+	 */
+	typedef typename GeometryTrait::Point Point;
+
+	/**
+	 * @brief Vertex that stores a point.
+	 */
+	class Graph_vertex : public SkeletonBlockerDS::Graph_vertex{
+	public:
+		/**
+		 * @brief Access to the point.
+		 */
+		Point& point(){	return point_; }
+		/**
+		 * @brief Access to the point.
+		 */
+		const Point& point() const {	return point_; }
+	};
+
+	/**
+	 * @brief Edge that allows to access to an index.
+	 * The indices of the edges are used to store heap information
+	 * in the edge contraction algorithm.
+	 */
+	class Graph_Edge : public SkeletonBlockerDS::Graph_edge{
+	public:
+		/**
+		 * @brief Access to the index.
+		 */
+		int& index();
+		/**
+		 * @brief Access to the index.
+		 */
+		int index();
+	};
+};
+
+
+
+#endif /* GUDHI_SKELETONBLOCKERGEOMETRICDS_H_ */