The Inventory IOD defines an Inventory of all Studies, Series, and SOP Instances managed by a repository, or a specified subset of those Studies, Series, and SOP Instances. It includes information about the available mechanisms to access such Studies, Series, and SOP Instances, including both DICOM and non-DICOM protocols. The Inventory provides selected Patient, Procedure, and Imaging Service Request Attribute values for the inventoried Studies.