ActsTrk::TrackContainerUtils Node1 ActsTrk::TrackContainerUtils - s_fitterAccessor - s_constFitterAccessor + setFitterType() + fitterType() + hasFitterType() + addFitterTypeProperty() Node2 std::string     Node2->Node1 -s_fitterColumnName Node3 std::basic_string< Char >     Node3->Node2