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<EntityDescriptor xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
   xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
   xmlns:attr="urn:oasis:names:tc:SAML:metadata:attribute"
   xmlns:ds="http://www.w3.org/2000/09/xmldsig#" entityID="https://IdentityProvider.example.com/SAML">
   <Extensions> 
       <attr:EntityAttributes>
            <saml:Attribute NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                            Name="urn:oasis:names:tc:SAML:attribute:assurance-certification">
                <saml:AttributeValue>https://refeds.org/sirtfi
                </saml:AttributeValue>
            </saml:Attribute>
       </attr:EntityAttributes> 
    </Extensions> 
<IDPSSODescriptor WantAuthnRequestsSigned="true"
                 protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol"> 
    <KeyDescriptor use="signing"> ... </KeyDescriptor> 
    <NameIDFormat>...</NameIDFormat> 
    <SingleSignOnService
        Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
        Location="https://IdentityProvider.example.com/SAML/SSO/Browser"/> ...
</IDPSSODescriptor>
... 
</EntityDescriptor>