Common use of Soundness Clause in Contracts

Soundness. Let a1,..., an be the children of the ADTree gate A with EAMAS models Ma1 ,..., Man , MA respectively. Let the sequence of actions P { } ··· ?ai1 si1 ?ai2 si2 ?aim sim take MA from its initial state l0 to its final state lA, where sj ok, nok . Then the corresponding ordered success or failure of the children ai1 ,..., aim make the ADTree gate A succeed.