+/** @defgroup XBT_set_basic Sets basic usage
+ * @ingroup XBT_set
+ *
+ * <center><table><tr><td><b>Top</b> <td> [\ref index]::[\ref XBT_API]::[\ref XBT_set]
+ * <tr><td><b>Prev</b> <td> [\ref XBT_set_cons]
+ * <tr><td><b>Next</b> <td> [\ref XBT_set_curs] </table></center>