Trk::DetailedTrackTruthCollection_p2 Node1 Trk::DetailedTrackTruthCollection_p2 Node2 std::vector< Entry > + elements Node2->Node1 +m_entries Node3 DataLink_p1 + m_SGKeyHash + DataLink_p1() Node3->Node1 +m_trackCollectionLink Node4 std::string Node4->Node3 +m_link Node5 std::basic_string< char > Node5->Node4