A person or entity in relationship to an authenticating OCLC customer institution. This is the barcode used by WMS Circulation. ILL processes store the barcode in the ILL Identifier. This value is one of several that are involved in matching an incoming record with an existing record for update. See documentation on the matching logic. Contains the identifier for the person that will be provided by a non-OCLC-managed authentication system. OCLC requires this element to allow correlation with stored OCLC user data at login time. Additionally, one or more identifiers from systems other than one used for authentication may be provided to enable correlation with an existing user record for update as part of data ingest if a barcode or ILL identifier is not provided or needs to be changed. Correlation data, the WmsCircPatronInfo/barcode and the WsILLInfo/illId are all compared against data stored in the same fields in the OCLC User Data Service to determine whether the record is meant to update an existing user or to create a new user. A unique identifier for the user for ILL processes. It may, but need not be, the user's library barcode. WMS Circulation customers (also) store the barcode in persona.wmsCircPatronInfo.barcode. This value is one of several that are involved in matching an incoming record with an existing record for update. See documentation on the matching logic. The OCLC Institution Registry id of the institution that manages the user's record. An entity id uniquely identifying the system providing authentication or the system providing an additional identifier for correlation - The value(s) to use should be determined in consultation with the OCLC implementation team. The unique identifier for the user in the source system. See the documentation for the element "correlationInfo".