MmDigit Node1 MmDigit - m_stripResponseTime - m_stripResponseCharge + MmDigit() + MmDigit() + MmDigit() + stripResponseTime() + stripResponseCharge() Node2 MuonDigit # m_muonId + MuonDigit() + ~MuonDigit() + MuonDigit() + setID() + identify() Node2->Node1 Node3 Identifiable + ~Identifiable() + identify() + identifyHash() + getHelper() Node3->Node2