This configuration file sets the details on the datasource that Transfer is going to be connected to, and results in the transfer.com.sql.Datasource bean that is available from http://docs.transfer-orm.com/html/transferapi/transfer/TransferFactory.html.
The xml schema file can be found at: /transfer/resources/xsd/datasource.xsd.
It is highly recommended that when creating a new datasource xml file, you validate your xml against this xml schema.