This corresponds to the home attribute of the Identifiable class in regrep RIM (regrep-rim-3.0-os.pdf, page 20) This is the XDSDocumentEntry.repositoryUniqueId attribute in the XDS metadata This is the XDSDocumentEntry.uniqueId attribute in the XDS metadata This corresponds to the home attribute of the Identifiable class in regrep RIM (regrep-rim-3.0-os.pdf, page 20) This is the XDSDocumentEntry.repositoryUniqueId attribute in the XDS metadata This is the XDSDocumentEntry.uniqueId attribute in the XDS metadata This corresponds to the ExtrinsicObject id in the eb RIM metadata a provides a linkage between the actual document data and its metadata