If your Decision Service integrates with databases or REST services, you will need a Datasource Configuration File when deploying the Decision Service. This is an XML file which defines the connection parameters for the data sources used by your Decision Service. It can be exported from the Vocabulary editor and modified for deployment. Separating Datasource connection parameters from the EDS file for your Decision Service allows you to easily change these parameters when, for example, moving from a test to a production environment.