Embedded Data Sources
You can insert (or embed) a data source into another data source.
This picture shows an EMP (Employee) data source with an inserted FUNC1 data source with a Function ID and a Short Description:
An embedded DataSource can be used as a kind of joined column, for example in a GridControl. This picture shows a GridControl object and a part of the Property Inspector for the GridCellControl with name EMBEDDED_FUNC_DESC.