With the ITP/SDK for iSeries a DID Developer can create and maintain both DIDs and DID-sources on the iSeries. DIDs are the functional units with which ITP models can be created and run (after downloading it to the PC). DID-sources are the technical descriptions of (a part of) an application in terms of Entries (and their relations) and User-defined functions. The DID-sources may be linked to DIDs. The DID sources are only significant for the DID Developer. The Model Developer does not know anything about DID sources and does not see a difference between Entries that are defined in different DID Sources.
Refer to Work with DIDs and Work with DID-sources for more information.