constraint propagator(one or more agents responsible for maintaining the consistency of the constraint; a constraint propagator is activated when the domain of any variable in the constraint is updated; в языке параллельного логического программирования в ограничениях B-Prolog 7.8 (2012) Alex_Odeychuk)
Delayed Event Propagator(функциональный блок E_DELAY в IEC 61499-1, см. также Lewis R.W. Modelling control systems using IEC 61499. Applying function blocks to distributed systems ssn)