function [validNames, modified] = makeValidName(names, modException)

            %MAKEVALIDNAME Construct valid table row names. The only row

            %   not allowed is ':' to avoid ambiguous subscripting.

            %

            %   MODEXCEPTION controls warning or error response when NAMES

            %   contains invalid names. Valid values for MODEXCEPTION are

            %   'silent' and 'error'.

            import matlab.internal.datatypes.warningWithoutTrace;

            import matlab.internal.tabular.private.rowNamesDim.checkReservedNames;

            if strcmp(modException,'error') 

                validNames = names; % return the originals, or possibly error 

                if ischar(names), names = { names }; end % unusual case, not optimized 

                checkReservedNames(names); 

                modified = false(size(names)); 

            else % make names valid

                validNames = names;

                conflicted = checkReservedNames(names);

                if any(conflicted)

                    validNames(conflicted) = matlab.lang.makeUniqueStrings(validNames(conflicted), validNames,namelengthmax);

                end

                modified = conflicted;

                if any(modified)

                    switch modException % error or warn per level specified

                        case 'silent'

                            % Only used by readtable

                        case 'warn' % Only used by loadobj

                            warningWithoutTrace(message('MATLAB:table:RowNameReservedBackCompat'));

                        otherwise

                            assert(false);

                    end

                end

            end 

        end