<saml:SubjectConfirmation xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
  <saml:NameID SPNameQualifier="https://sp.example.org/authentication/sp/metadata" Format="urn:oasis:names:tc:SAML:2.0:nameid-format:transient">SomeNameIDValue</saml:NameID>
  <saml:SubjectConfirmationData NotBefore="2001-04-19T04:25:21Z" NotOnOrAfter="2009-02-13T23:31:30Z" Recipient="https://simplesamlphp.org/sp/metadata" InResponseTo="SomeRequestID" Address="127.0.0.1" test:attr1="testval1" test:attr2="testval2" xmlns:test="urn:test:something">
    <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
      <ds:KeyName>SomeKey</ds:KeyName>
    </ds:KeyInfo>
    <some>Arbitrary Element</some>
  </saml:SubjectConfirmationData>
</saml:SubjectConfirmation>
