This type enumerates the set of types of SAML principals. The schema for this type MUST be as follows:
<simpleType name="PrincipalTypes"> <restriction base="string"> <enumeration value="Self" /> <enumeration value="Scope" /> <enumeration value="Authority" /> </restriction> </simpleType>
Self: Indicates that the principal is this STS server.
Authority: Indicates that the principal is a SAML Identity Provider, identified by an Entity Identifier, as per [SAMLCore2] section 8.3.6.