CaloCellVolume Node1 CaloCellVolume + volume Node2 Identifier - m_id + Identifier() + Identifier() + Identifier() + operator=() + operator=() + ~Identifier() + Identifier() + Identifier() + Identifier() + Identifier() and 38 more... - operator|=() - operator&=() - extract() - mask_shift() - extract() Node2->Node1 +channelID