Currely only below datasouces are available in API, connectors have been introduced to the product and being used more and more widely,
please expose API to be able to load/replace data from connectors.
Spotfire.Dxp.Data.Import.DatabaseDataSource
Spotfire.Dxp.Data.Import.DataTableDataSource
Spotfire.Dxp.Data.Import.FileDataSource
Spotfire.Dxp.Data.Import.InformationLinkDataSource
Spotfire.Dxp.Data.Import.SbdfLibraryDataSource
Thanks.