Source settings connect the source document definition to an actual source by having you specify a file name. The Source Settings window also provides a filter that you can use to define precisely which documents from the source to integrate.
The Source Settings window automatically opens when you first add a new or existing XML source definition to an integration.You can use this window to specify the physical data file to be used for the integration. If you already added a source to the integration, you can double-click Source Settings in the Integration window.
By specifying a file path in the Source Settings window, you are connecting the document definition of the source to the actual source.