User ID at the home organisation

Description The user's unique ID at his home organisation (the IdP where the user is logged in)
# of values Sigular
Permissible values All values have the form ID@org, where ID is the user's unique ID and org that of his organisation. The org part must match the value of the schacHomeOrganization attribute.
Semantics  
Examples jens.hansen@ku.dk
Typical use Authentication, Logging
LDAP name eduPersonPrincipalName
WAYF status MUST
Notes This attribute has a special status in WAYF in that WAYF will stop a login flow if an identity provider has sent WAYF a malformed value of eduPersonPrincipalName.