This transaction is used by the Document Source actor to provide one or more documents to the IHE XDS Document Repository along with the metadata that describes the document and which will be stored in the IHE XDS Document Registry.
The Document Source will send both the document data and the metadata to the Document Repository actor, the Document Repository will store the document data and forwards the metadata to the Document Registry which handles their persistence.
For more information about the provide & register Document Set-b please see IHE IT Infrastructure Technical Framework Volume 2b (ITI TF-2b) on page 154 - 164