DataHeaderCnv_p3 Node1 DataHeaderCnv_p3 + DataHeaderCnv_p3() + ~DataHeaderCnv_p3() + createTransient() + persToTrans() + createPersistent() + transToPers() + insertDHRef() Node2 DataHeaderElementCnv_p3 + DataHeaderElementCnv_p3() + ~DataHeaderElementCnv_p3() + persToTrans() + transToPers() Node2->Node1 -m_elemCnv