+XBT_PUBLIC(tmgr_trace_t) tmgr_trace_new(const char *filename);
+XBT_PUBLIC(tmgr_trace_t) tmgr_trace_new_from_string(const char* id, const char *input, double periodicity);
+XBT_PUBLIC(tmgr_trace_t) tmgr_empty_trace_new(void);
+XBT_PUBLIC(void) tmgr_trace_free(tmgr_trace_t trace);