Name
samlSubjectID
Categories
AAF Conditional

Number of values
One
Description
A scoped, opaque, not reassignable, non-targeted pseudonym for a subject (person)

Notes on usage
Intended to replace legacy identifiers such as auEduPersonSharedToken, eduPersonUniqueID and possibly eduPersonPrincipalName (e.g. where displaying the identifier value to the subject or other subjects within an application is not relevant).