Trk::PRD_MultiTruthCollection_p4::Entry Node1 Trk::PRD_MultiTruthCollection _p4::Entry + Entry() + Entry() Node2 HepMcParticleLink_p3 # m_mcEvtIndex # m_evtColl + HepMcParticleLink_p3() + HepMcParticleLink_p3() Node2->Node1 +particle Node3 long Node3->Node1 +id Node3->Node2 #m_id