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AssertionIDRequest
<AssertionIDRequest xmlns="urn:oasis:names:tc:SAML:2.0:protocol"
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                    xsi:schemaLocation=
                                "urn:oasis:names:tc:SAML:2.0:protocol
                                 saml-schema-protocol-2.0.xsd"
                    ID="abe567de6"
                    Version="2.0"
                    IssueInstant="2005-01-31T11:58:00Z"
                    Destination="https://www.AirlineInc.com">
    <AssertionIDRef xmlns="urn:oasis:names:tc:SAML:2.0:assertion">
        ffaed4512a
    </AssertionIDRef>
    <AssertionIDRef xmlns="urn:oasis:names:tc:SAML:2.0:assertion">
        34accee45
    </AssertionIDRef>
    <AssertionIDRef xmlns="urn:oasis:names:tc:SAML:2.0:assertion">
        999eee123
    </AssertionIDRef>
</AssertionIDRequest>
"Hey IdP, give me the assertions
that you have which match any of
these three IDs."
see example07