Trk::RecVertex_p2 Node1 Trk::RecVertex_p2 + m_position + RecVertex_p2() Node2 Trk::FitQuality_p1 + m_chiSquared + m_numberDoF + FitQuality_p1() Node2->Node1 +m_fitQuality Node3 TPObjRef # m_index + TPObjRef() + TPObjRef() + isNull() + typeID() + topLevelCnvID() + index() Node3->Node1 +m_positionError Node4 TPObjRef::typeID_t + m_TLCnvID + m_cnvID + typeID_t() + topLevelCnvID() + cnvID() + value() + isNull() Node4->Node3 #m_typeID