public interface BooleanAggregateState
extends AggregateState
BooleanAggregateState is the subinterface of
AggregateState that is used for aggregate methods with return
value of type boolean. Its precise usage is specified by the
XL programming language.
Returns the result of the aggregation. This is only valid
after the aggregate method has been invoked for a last time
with its finished argument set to true.