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<AuthnRequest xmlns="urn:oasis:names:tc:SAML:2.0:protocol"
                          ForceAuthn="true"
                          ProviderName="CarRentalInc.com"
                          ID="abe567de6"
                          Version="2.0"
                          IssueInstant="2005-01-31T11:58:00Z"
                          Destination="https://www.AirlineInc.com">
    <Subject xmlns="urn:oasis:names:tc:SAML:2.0:assertion">
        <NameID Format="urn:oasis:names:tc:1.1:nameid-format:emailAddress">
            j.doe@acompany.com
        </NameID>
    </Subject>
</AuthnRequest>
A human-readable name
of the SP that is making the
request.
A unique identifier for this
request message.  We will see
that the response message has
an attribute called
InResponseTo, and it must
match this ID value.