In an XML, selecting just some children elements and moving them up to the first level

Hi,

   

I have an XML generated from “Asset Mgmt - Asset” and “Service Agreement Product” Integration Components in a Workflow like this

<?xml version="1.0"encoding="UTF-8"?>

<SiebelMessage MessageId="1-21YC5J" IntObjectName="SW Asset Activation Info" MessageType="Integration Object" IntObjectFormat="Siebel Hierarchical">

                  <ListOfAsset>

                                  <Asset>

                                                  <AssetId>1-2EQT9RX</AssetId>

                                                  <ListOfServiceAgreementProduct>

                                                                  <ServiceAgreementProduct>

                                                                                  <Created>01/01/2013</Created>

                                                                                  <MaintenanceEndDate>05/31/2015</MaintenanceEndDate>

                                                                                  <MaintenanceStartDate>05/01/2015</MaintenanceStartDate>

                                                                  </ServiceAgreementProduct>

                                                                  <ServiceAgreementProduct>

                                                                                  <Created>01/01/2014</Created>

                                                                                  <MaintenanceEndDate>08/31/2015</MaintenanceEndDate>

                                                                                  <MaintenanceStartDate>06/01/2015</MaintenanceStartDate>

                                                                  </ServiceAgreementProduct>

                                                  </ListOfServiceAgreementProduct>

                                  </Asset>

                  </ListOfAsset>

</SiebelMessage>

  

I would like to take the MaintenanceEndDate and MaintenanceStartDate elements where created is the latest and move them to the top level, so the resulting XML would be like this: