jet::JetFourMomAccessor Node1 jet::JetFourMomAccessor + operator()() + operator()() + operator()() + operator()() Node2 xAOD::JetAttributeAccessor ::AccessorWrapper< xAOD ::JetFourMom_t > # m_a + AccessorWrapper() + setAttribute() + getAttribute() + getAttribute() + isAvailable() + operator()() + operator()() Node2->Node1 Node3 xAOD::JetAttributeAccessor ::Named # m_name + Named() + name() Node3->Node2