columnar::ContainerId::particle Node1 columnar::ContainerId ::particle + idName Node3 columnar::ContainerId ::particle1 + idName Node1->Node3 Node2 columnar::ContainerId ::regularCIBase< xAOD ::IParticle, xAOD::IParticle Container > + isContainerId + regularObjectId + regularColumnAccessorArray + isMutable + perEventRange + perEventId Node2->Node1