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The content (or attribute value) of the eduPersonTargetedID attribute is defined to be a SAML 2.0 persistent NameID (cf. MACE-Dir SAML Attribute Profiles, section 3.3.1.1, lines 390-393), i.e., an XML structure. Abstractly it's a 3-tuple made up of the IDP's entityID, the SP's entityID and the subject-specific part. It could be called a "service-specific pseudonym" in that it's an opaque identifier that differs for each service a subject is accessing.

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