TrackParticleTruthCollection Node1 TrackParticleTruthCollection - m_trackParticleContainer + TrackParticleTruthCollection() + ~TrackParticleTruthCollection() + trackParticleContainerLink() + TrackParticleTruthCollection() Node2 std::map< Rec::TrackParticle TruthKey, TrackParticleTruth > + keys + elements Node2->Node1