Type Definition kusama_runtime::Barrier

pub type Barrier = (TakeWeightCredit, AllowTopLevelPaidExecutionFrom<Everything>, AllowUnpaidExecutionFrom<IsChildSystemParachain<ParaId>>, AllowKnownQueryResponses<XcmPallet>, AllowSubscriptionsFrom<OnlyParachains>);

The barriers one of which must be passed for an XCM message to be executed.