if (not type) {
THROWF (tracing_error, 1, "mark_type with name (%s) is not declared", mark_type);
} else {
XBT_DEBUG("MARK %s %s", mark_type, mark_value);
if (not type) {
THROWF (tracing_error, 1, "mark_type with name (%s) is not declared", mark_type);
} else {
XBT_DEBUG("MARK %s %s", mark_type, mark_value);