A repository system may support multiple access mechanisms for each stored instance - DIMSE C-MOVE retrieve (Annex C “Query/Retrieve Service Class (Normative)” in PS3.4), web services-based Studies Service (Section 10 “Studies Service and Resources” in PS3.18), and perhaps multiple non-DICOM direct file access protocols (Annex P “Stored File Access Through Non-DICOM Protocols (Normative)” in PS3.3). The DIMSE Retrieve AE Title (0008,0054) is returned in the query response without specific request of the SCU (see Section C.4.1.1.3.2 “Response Identifier Structure” in PS3.4). The Repository Query SOP Class defines File Set Access Sequence (0008,0419) at the Study and Series levels and File Access Sequence (0008,041A) at the Instance level as Key Attributes. The SCU can request these Attributes to obtain a non-DICOM protocol URI link to the stored instance (see Section C.6.4.1.3 “File Set Access Sequence and File Access Sequence” in PS3.4).

See Section YYYY.7.2 for discussion of using non-DICOM protocols.