+/**
+ * \ingroup XBT_log
+ *
+ * Prints some help about using the logging infrastructure.
+ */
+XBT_PUBLIC(void) xbt_log_help(void);
+
+/**
+ * \ingroup XBT_log
+ *
+ * Prints the log category hierarchy.
+ */
+XBT_PUBLIC(void) xbt_log_help_categories(void);
+