AthenaPoolTestMapDataLink Node1 AthenaPoolTestMapDataLink + AthenaPoolTestMapDataLink() + AthenaPoolTestMapDataLink() + AthenaPoolTestMapDataLink() * m_particle * barcode() * eventIndex() * cptr() * AthenaPoolTestMapDataLink() * AthenaPoolTestMapDataLink() * AthenaPoolTestMapDataLink() Node2 AthenaPoolTestMapDataLink ::ExtendedBarCode - m_evtIndex + ExtendedBarCode() + ExtendedBarCode() + barcode() + eventIndex() Node2->Node1 -m_extBarcode Node3 long Node3->Node2 -m_BC