This image shows the CustomerData__To_Customer.xsl tab in Oracle JDeveloper. This tab is divided into three columns. The first column contains is labeled as "Source: ReadCust.wsdl", the second column is unlabeled, and the third column is labeled as "Target: USCustomer.wsdl." The first column lists the elements in the ReadCust.wsdl file and the third column lists the elements in the USCustomer.wsdl file. The middle column is empty. This image also shows multiple links between the source and target elements.