AxisInfo Node1 AxisInfo + m_log + m_autoset + m_symmetric + m_rangeset + m_lo + m_hi + m_norm + m_refnorm + m_binwidth + m_offset + m_trim + AxisInfo() + tag() + log() + autoset() + normset() + refnormset() + symmetric() + rangeset() + trim() + offset() + lo() + hi() + binwidth() + c_str() + split() Node2 std::string Node2->Node1 +m_tag +m_info Node3 std::basic_string< char > Node3->Node2