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Three kinds of requests for existing assertions
•AssertionIDRequest: Hey IdP, give me all the assertions that you have with ID="___" or ID="___" or …
•SubjectQuery: Hey IdP, give me all the assertions that you have for this ___ Subject
–Note: the assertions could be authentication assertion, attribute assertions, or authorization assertions.
•AuthnQuery: Hey IdP, give me all the assertions you have that contain an authentication statement for this ___ Subject