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       // contructor
          \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Framework\Controller\Result\RawFactory $resultRawFactory
       
        $result = $this->resultRawFactory->create();
        $result->setHeader('Content-Type', 'text/xml');
          $xml .= '    </SalesOrder>
                  </SalesOrders>
                </Company>';
        return $result->setContents($xml);