void bridge_data(unsigned int epoint_from, struct join_relation *relation_from, union parameter *param);
void remove_relation(struct join_relation *relation);
struct join_relation *add_relation(void);
void bridge_data(unsigned int epoint_from, struct join_relation *relation_from, union parameter *param);
void remove_relation(struct join_relation *relation);
struct join_relation *add_relation(void);