+/**
+ * \ingroup XBT_log_implem
+ * \param cat the category (not only its name, but the variable)
+ * \param additivity whether logging actions must be passed to parent.
+ *
+ * Programatically sets whether the logging actions must be passed to
+ * the parent category.
+ * (the prefered interface is throught xbt_log_control_set())
+ *
+ */
+XBT_PUBLIC(void) xbt_log_additivity_set(xbt_log_category_t cat,
+ int additivity);
+
+/** @brief create a new simple layout
+ *
+ * This layout is not as flexible as the pattern one
+ */
+XBT_PUBLIC(xbt_log_layout_t) xbt_log_layout_simple_new(void);
+XBT_PUBLIC(xbt_log_appender_t) xbt_log_appender_file_new(xbt_log_layout_t layout);
+
+
+/* ********************************** */
+/* Functions that you shouldn't call */
+/* ********************************** */