This diagram represents metadata only (not file management or other admin tasks) for objects that are accessioned through the self-deposit tool Hydrus by SUL staff and cataloged by the MDU in MARC. The boxes under "Self-deposit interface" represent the metadata-related tasks an internal user performs through that interface in this workflow. Currently this model is commonly used for digital files received by Acquisitions or acquired by curators. The self-deposit tool serves as a convenient way to get a file into the SDR, notify MDU staff that cataloging is needed, and pass information such as the catkey and purl for the object to MDU. New items are deposited to existing collections that have been set up with the appropriate rights, permissions, etc.