**Synchronization Related Attributes**
ATABORT opt_set L_BRA abloc R_BRA
TEMPO opt_set expr
TEMPO opt_set L_BRA event_list_expr R_BRA
GRAIN opt_set extended_duration
COEF opt_set expr
ACTION opt_set maxname mess_cel
ACTION opt_set L_BRA
abloc R_BRA
IMMEDIATE
STATIC_SCOPE
NOREC
EXCLUSIVE