+#include "xbt/misc.h" /* SG_BEGIN_DECL */
+#include "xbt/function_types.h"
+
+SG_BEGIN_DECL()
+
+/** @addtogroup XBT_set
+ * @brief A data container consisting in \ref XBT_dict and \ref XBT_dynar
+ *
+ * The elements stored in such a data structure can be retrieve both by
+ * name and by ID. For this to work, the first fields of the structures
+ * stored must begin with the following fields:
+ * \verbatim struct {
+ unsigned int ID;
+ char *name;
+ unsigned int name_len;
+ // my other fields, constituting the payload
+} my_element_type_t; \endverbatim
+ *
+ * Since we are casting elements around, no protection is ensured by the
+ * compiler. It is thus safer to define the headers using the macro
+ * defined to that extend:
+ * \verbatim struct {
+ XBT_SET_HEADERS;
+
+ // my other fields, constituting the payload
+} my_element_type_t; \endverbatim
+ *
+ * It is now possible to remove an element from such a data structure.
+ *
+ * @todo
+ * Such a datastructure was necessary/useful to store the GRAS type
+ * descriptions, but it should be reworked to become generic.
+ *
+ */
+
+
+/** @defgroup XBT_set_cons Set and set elements, constructor/destructor
+ * @ingroup XBT_set
+ *
+ * @{
+ */
+/** \brief Opaque type representing a set */
+typedef struct xbt_set_ *xbt_set_t;