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+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef CONCEPT_SKELETON_BLOCKER_SKELETONBLOCKERGEOMETRICDS_H_
+#define CONCEPT_SKELETON_BLOCKER_SKELETONBLOCKERGEOMETRICDS_H_
+
+namespace Gudhi {
+namespace skeleton_blocker {
+
+/** 
+ * \brief Concept for template class of  Skeleton_blocker_geometric_complex .
+ * It must specify a GeometryTrait which contains a Point definition.
+ * 
+ * Graph_vertex must specify how to access to a point.
+ * Graph_edge must specify how to access to an index.
+ * 
+ */
+// TODO(DS): the index is just for contraction, to remove
+
+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();
+    /**
+     * @brief Access to the point.
+     */
+    const Point& 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();
+  };
+};
+
+}  // namespace skeleton_blocker
+
+namespace skbl = skeleton_blocker;
+
+}  // namespace Gudhi
+
+#endif  // CONCEPT_SKELETON_BLOCKER_SKELETONBLOCKERGEOMETRICDS_H_