docs: public void newCell(final int row,
              final int column,
              final String value,
              int mergedColStart) {
          if ( isCellValueEmpty( value ) ) {
              return;
          }
          if ( _isInRuleTable && row == this._ruleStartRow ) {
              return;
          }
          if ( this._isInRuleTable ) {
              processRuleCell( row, column, value, mergedColStart );
          } else {
              processNonRuleCell( row, column, value );
          }
      }