MuonCalib::HistogramId Node1 MuonCalib::HistogramId + TUBE + LAYER + MULTILAYER + CHAMBER + MEZZ_CARD - m_id + HistogramId() + Initialize() + operator>() + operator<() + getIdInt() + HistogramName() Node2 std::string Node2->Node1 -m_histogram_name Node3 std::basic_string< char > Node3->Node2